Elimination Diets

Diet Reference Archive: a clinical method rather than a single diet

Elimination Diets

A clinical method in which a specific food or group of foods is removed for a set period and then brought back, to see whether a reaction follows. Clinicians use it to diagnose some food allergies and to treat a few conditions, above all eosinophilic esophagitis; it is also sold to the public with food sensitivity tests.

Family: Therapeutic and elimination dietsPromoted by: allergists, gastroenterologists and dietitians, as a method; also test companies, for food sensitivityFirst appeared: clinical reports from the 1960s and 1970s; diets for eosinophilic esophagitis from 1995GRADE: Low for an empiric 6-food elimination diet compared with no treatment, for histologic remission after the first elimination course in children and adults with eosinophilic esophagitis, from single-arm studies against historical controls; published guideline rating, AGA Institute and Joint Task Force (Hirano et al., 2020)

ON THIS PAGE

1. In brief
2. Overview
3. In practice
4. For the coach
5. The evidence (opens on request)
6. Mechanisms (opens on request)
7. Risks, contraindications and myths (opens on request)
8. Key terms
9. Review questions
10. References
11. Evidence rating and review record

The summary and sections 1 to 3 are the short version and are open when the page loads. Sections 4 to 6 hold the research detail, the biology, and the cautions. Each of those opens when you select its heading, and you can read the page without opening them. This page describes the general method. Low-FODMAP Diet, Gluten-Free Diet and Whole30 have their own pages; the other named elimination approaches are separate topics. This page does not repeat their evidence. Back to the Diet Reference Archive index.

In brief

What is it? Not one diet but a clinical method. A clinician removes a specific food, or a set group of foods, for a defined period, watches whether symptoms or test results change, and then brings the food back, often in a supervised test called a food challenge, to see whether the reaction returns. Which foods are removed, for how long and how they come back depend on the condition being investigated (Boyce et al., 2010; Malone & Daley, 2024).

Does it work? It depends on the use. For eosinophilic esophagitis, an allergic inflammation of the esophagus, removing common trigger foods is a treatment 2 U.S. guidelines suggest, with low-certainty evidence (Dellon et al., 2025; Hirano et al., 2020). For diagnosing food allergy, removing a suspected food, then a supervised challenge, is standard practice (Boyce et al., 2010). For eczema, removing foods may slightly improve severity, with low certainty (Oykhman et al., 2022), but the U.S. allergy societies' joint guideline suggests against it (Chu et al., 2024).

For attention deficit hyperactivity disorder (ADHD), a recent trial did not establish that elimination was better than an actively supported healthy diet (Huberts-Bosch et al., 2024). For migraine and irritable bowel syndrome, trials of diets chosen from blood or cell tests are few and mostly small, rated here moderate, low, very low or not yet. The allergy bodies cited here advise against choosing foods from IgG tests.

Is it safe? For a set period under clinical supervision, the trials that reported harms found few. The cautions come from removing many foods, removing them for a long time, or doing it without a clinician. Prolonged diets that omit several foods have been reported to cause severe malnutrition, and the U.S. food allergy guidelines call for nutrition counseling and growth monitoring for every child with a food allergy (Boyce et al., 2010). In one clinic, some children with food-related eczema had a new, immediate allergic reaction, a few of them severe, to a food they had been avoiding (Chang et al., 2016). A growing list of avoided foods can also become restrictive eating (Murphy et al., 2025).

Who should not do it without talking to a doctor or dietitian first? Everyone, because the method starts with a clinician deciding what is being tested. Most of all: anyone whose symptoms have not been diagnosed; anyone with a known or suspected food allergy, who never brings back a food that caused a reaction without the allergist; children and teenagers; people who are pregnant or breastfeeding; anyone with a current or past eating disorder; and anyone taking insulin, a sulfonylurea or warfarin.

Related pages: Low-FODMAP Diet, Gluten-Free Diet and Whole30. Autoimmune Protocol Diet, Dairy-Free Diet, Specific Carbohydrate Diet, GAPS Diet and Low-Histamine Diet are separate topics on the archive index. Full list on the archive index.

1. Overview

What you do

An elimination diet has 3 steps when clinicians use it. First, a physician, allergist or gastroenterologist evaluates the symptoms and decides what question the diet is meant to answer: whether a particular food causes a reaction, or whether removing a group of foods will settle a diagnosed condition. Second, the chosen food or foods are removed completely for a defined period. Third, the foods are brought back one at a time while the clinician watches what happens, by symptoms, by examination or, for some conditions, by repeat testing. The first step is not optional: a recent clinical review states that an elimination diet "cannot replace a comprehensive, guideline-directed evaluation" (Malone & Daley, 2024).

How long each step lasts depends on the condition. Before a food challenge for suspected food allergy, the U.S. food allergy guidelines describe removing the suspected foods for 2 to 8 weeks, all at the same time (Boyce et al., 2010). For eosinophilic esophagitis, the American College of Gastroenterology describes an initial course of 6 to 8 weeks, followed by an endoscopy with biopsies, and then a reintroduction in which each food or food group comes back for 6 to 8 weeks before the next endoscopy (Dellon et al., 2025). For a child with suspected food-related ADHD symptoms, the trials used about 5 weeks (Pelsser et al., 2011).

There are several ways to choose what to remove. A targeted diet removes the one food a history points to, such as milk. An empiric diet removes the foods most often responsible for a condition without testing first: for eosinophilic esophagitis, the 6-food diet removes animal milk, wheat, egg, soy, nuts and peanuts, and fish and shellfish; the 4-food diet removes milk, egg, wheat and soy; and the 1-food diet removes animal milk alone (Dellon et al., 2025; Kliewer et al., 2023, 2025). A test-directed diet removes foods chosen from allergy test results. An elemental diet replaces all food with an amino acid-based formula for a time (Hirano et al., 2020). And a few-foods or oligoantigenic diet narrows eating to a short list of foods thought unlikely to cause reactions (Bath-Hextall et al., 2008).

Reintroduction is the step that answers the question. For an immediate, IgE-mediated food allergy, it is an oral food challenge: the food is given in a medical facility, starting with a very small dose and increasing while the person is watched for a reaction, with treatment for a severe reaction ready (Boyce et al., 2010). For eosinophilic esophagitis, a food is a trigger if inflammation returns on the next biopsy, and it is then removed again (Dellon et al., 2025).

What you do not do

During elimination the rules are firm, because a food that is only partly removed cannot answer the question; the U.S. guidelines say that all the foods in question "must be strictly avoided simultaneously" before a challenge (Boyce et al., 2010). The method is not meant to become a long list of foods avoided indefinitely. When a food is confirmed as a trigger, that food is avoided; other foods are kept in the diet. The European allergy guideline recommends that people with a confirmed food allergy keep eating the foods they tolerate, including foods they are sensitized to but tolerate, because a diverse diet matters for growth and development (Santos et al., 2025).

The method also does not choose foods from tests that have not been validated for this purpose, such as blood tests for IgG antibodies to foods; section 6 quotes the professional bodies on this. And it is not the same as the named diets that remove foods for their own reasons. The Low-FODMAP Diet page reports that a Monash University dietitian describes that diet's first step as "a substitution diet" rather than an elimination diet, because the person swaps a food high in certain fermentable carbohydrates for a lower one rather than cutting whole foods (Dwyer, 2018). This page keeps that distinction.

Where it came from

Removing foods to see whether symptoms change is an old clinical idea. A 2026 report from the allergy unit of Royal Prince Alfred Hospital in Sydney describes how, in the 1960s and 1970s, several authors reported apparent benefit from excluding certain food additives and natural food chemicals in people with reactions involving the skin, gut, airways and nervous system, and how that unit has offered an elimination diet followed by blinded challenges for 48 years (Swain et al., 2026). About 40 years before a 2017 review of the field, the pediatric allergist Benjamin Feingold proposed that food additives and foods rich in salicylates might contribute to hyperactivity in children, which started research on diet and what is now called ADHD (Pelsser et al., 2017).

In 1983, a research group reported that 93 percent of 88 children with severe, frequent migraine recovered on oligoantigenic diets, that the foods provoking their headaches were identified by reintroducing them one at a time, and that the role of those foods was tested in a double-blind trial in 40 of the children (Egger et al., 1983). In 1995, a case series of 10 children with eosinophils in the esophagus who had not responded to reflux treatment improved on an elemental formula, and their symptoms returned with food challenges; the American College of Gastroenterology describes such early studies as supporting the idea that the condition is triggered by food (Dellon et al., 2025). The U.S. food allergy guidelines of 2010 set out when an elimination diet helps diagnose a food allergy and when an oral food challenge is needed (Boyce et al., 2010).

A separate, commercial line developed alongside. In 2012 the Canadian Society of Allergy and Clinical Immunology described increased marketing of food-specific IgG testing directly to the public, through a nationwide pharmacy chain, "supposedly as a simple means by which to identify 'food sensitivity'" (Carr et al., 2012). Such tests are now sold with instructions for an elimination diet based on their results (Everlywell, n.d.).

What it claims to do

In clinical use the claims are specific to a condition: that removing a confirmed trigger prevents allergic reactions; that a supervised elimination and challenge can show whether a suspected food causes a reaction; and that removing trigger foods can bring eosinophilic esophagitis into remission. Section 4 reports how well each is supported.

The public claims are broader. A company selling an at-home IgG test says its results "can inform a two-part elimination diet" and that higher IgG reactivity "can mean there's a possibility that that food item may be causing your symptoms" (Everlywell, n.d.). The Whole30 page reports that company's description of elimination diets as the gold standard for identifying food sensitivities. Clients also bring the idea that an elimination diet is a good way for anyone to find out what they are sensitive to. Section 6 takes these up.

What it gets right

The method takes symptoms that people link to food seriously and tests the link instead of guessing. Its core logic, remove, watch, bring back and confirm, is how allergists confirm a food allergy, and the reintroduction step protects people from avoiding foods they do not need to avoid. The U.S. guidelines report that when suspected foods were tested in double-blind challenges, only about one third were confirmed, and that challenge testing "prevents unnecessary dietary avoidance" (Boyce et al., 2010).

For eosinophilic esophagitis it offers a treatment that does not depend on medication; the American College of Gastroenterology states that dietary intervention "should be offered to patients as an alternative to medical therapy, so they can make an informed decision about their care" (Dellon et al., 2025). These are the parts a coach can honor in a client's reasons without endorsing any particular diet.

How clients describe it, and what it gets confused with

Clients say "I'm doing an elimination diet," "I cut out dairy to see what happens," "my test says I'm sensitive to eggs and almonds," "I'm off the top allergens," "my GI doctor has me on the six-food diet," "we're doing a milk challenge at the allergist," or "I'm doing a reset." Each can mean something different, from a supervised treatment to a list from an online test. Asking who set up the plan, and what it is testing, comes first.

It is most often confused with the named diets that remove foods. The Low-FODMAP Diet, the Gluten-Free Diet and Whole30 have their own pages, with their own evidence. Autoimmune Protocol Diet, Dairy-Free Diet, Specific Carbohydrate Diet, GAPS Diet and Low-Histamine Diet are separate topics on the archive index. The word "reset" also points to Detoxes and Cleanses. This page covers only the general method and the conditions for which the method itself has been studied.

2. In practice

A typical day of eating

There is no single elimination diet, so there is no single typical day. The 2 days below are this page's own illustrations, not plans from a source. An adult whose gastroenterologist has prescribed a 1-food diet removing animal milk for eosinophilic esophagitis might eat oatmeal made with water or a fortified soy drink, with fruit and peanut butter; a turkey sandwich on ordinary bread with a salad; and chicken, rice and roasted vegetables cooked in oil rather than butter, reading labels for milk ingredients in bread, sauces and snacks. Calcium and vitamin D from the milk that is gone are what the dietitian checks first.

The same person on a 6-food diet would also remove wheat, egg, soy, nuts and peanuts, and fish and shellfish, so the day becomes rice or corn cereal with fruit, a rice bowl with chicken, beans and vegetables, and pork or beef with potatoes and a vegetable, with every packaged food checked for 6 groups of ingredients. The difference between those 2 days is the reason the 1-food and 6-food diets have been compared directly in trials, described in section 4.

Cost, products, and who profits

The method itself is free, and many foods that remain on most elimination diets, such as rice, potatoes, beans, fresh meat, vegetables and fruit, are ordinary and inexpensive. Costs come from 3 places. The first is the clinical care around it: allergist and gastroenterologist visits, dietitian visits, and, for eosinophilic esophagitis, an endoscopy at the end of each step of reintroduction. The American College of Gastroenterology notes that an elemental formula is itself expensive, with insurance coverage available in only a minority of U.S. states, and that a lengthy reintroduction needs repeated endoscopies (Dellon et al., 2025). The second is "free-from" substitute foods, which the European allergy guideline describes as usually more expensive than standard products and sometimes of lower nutritional value (Santos et al., 2025).

The third is the testing sold to the public. On October 19, 2026, one U.S. company listed an at-home IgG "food sensitivity" test at $199 for 96 foods and $299 for 204 foods, with a finger-prick sample and results that it says come with guidance for an elimination diet. The same page says the test "is not a food allergy test" and that the company's tests "are not intended to diagnose any disease or condition" (Everlywell, n.d.). In 2012, the Canadian allergy society reported that such testing in Canada was often priced in the $400 to $700 range (Carr et al., 2012). Section 6 reports what the allergy bodies say about these tests.

Money also touches the research. A 2017 review of diet and ADHD discloses that its first author, who was also first author of the main restricted elimination diet trial, is the franchiser of a restricted elimination diet protocol and has received honoraria for applying it (Pelsser et al., 2017). A trial of IgG-guided elimination for migraine was supported by a small grant from the test laboratory, which also ran the tests and prepared the diet sheets (Mitchell et al., 2011), and a trial of a diet guided by a leukocyte activation test for irritable bowel syndrome was funded by a research grant from Cell Science Systems (Ukashi et al., 2026).

For irritable bowel syndrome, the test laboratory in a 2004 trial ran the IgG tests and prepared both the true and the sham diet sheets (Atkinson et al., 2004), and the registry record of a 2025 trial lists Biomerica, the maker of its IgG test, as lead sponsor (Biomerica, 2018). A funder's interest does not by itself make a result wrong; section 4 says where it could have shaped one.

For someone with limited money, time or store access, the cheaper path runs through ordinary foods the person tolerates and a dietitian's plan rather than specialty products or private testing. This is observation rather than measured data.

Environmental footprint

The searches for this page found no study of the environmental footprint of elimination diets; the footprint depends almost entirely on which foods are removed and what replaces them, so it cannot be stated for the method as a whole.

Cultural fit

The foods most often removed, milk, wheat, egg and soy, are staples in many food traditions, from bread and cheese to tortillas, noodles, tofu and dairy-based sweets, and a few-foods diet removes almost everything familiar for a time. The European allergy guideline says that individualized dietary advice is needed to account for traditional foods, cultural and religious dietary patterns, vegetarian and vegan diets, ethnic and racial differences and socioeconomic issues, and to avoid nutritional deficiencies (Santos et al., 2025). A vegetarian who removes milk, egg and soy loses several main protein sources at once, which is a question for a dietitian. Because a confirmed trigger is usually a single food or a few, most traditions can be kept largely intact once reintroduction is complete.

What makes people stop

Adherence falls as the diet becomes stricter. In an adult study of an elemental formula for eosinophilic esophagitis, 38 percent did not adhere (Dellon et al., 2025). In a randomized trial in children, 32 percent withdrew from a 4-food diet against 11 percent from a milk-only diet (Kliewer et al., 2025). In the Sydney hospital's food intolerance program, 48.5 percent of the 14,119 patients who started the elimination diet were lost to follow-up (Swain et al., 2026). A clinical review lists health literacy, socioeconomic status, monotonous food choices and anxiety about the diet among barriers to adherence (Malone & Daley, 2024).

The burden falls on families too. In a study of 123 children who had improved on an elimination diet for suspected non-IgE-mediated gut allergy, parents' scores for family quality of life were low, particularly for daily activities and worry, and the number of foods excluded was among the factors linked with the scores (Meyer et al., 2017). Beyond these figures, what follows is observation: shared meals, school lunches, travel and eating out are where elimination diets are hardest to keep.

What happens when you stop

The method is designed to end with reintroduction, and what happens next depends on what reintroduction shows. Often the suspected food turns out not to be the problem: only about one third of suspected foods were confirmed in double-blind challenges (Boyce et al., 2010), and the American College of Gastroenterology notes that although up to 20 percent of the population report adverse reactions to food, only 2 to 3 percent develop recurrent symptoms when rechallenged with the offending food (Lacy et al., 2021). In the INCA trial for ADHD, 19 of 30 children who had responded to the diet relapsed when foods were reintroduced in a blinded phase, whether those foods were high or low on IgG testing (Pelsser et al., 2011).

When a food is a trigger, bringing it back brings the problem back. In eosinophilic esophagitis, a food that causes inflammation to return on biopsy is removed again for the long term, and the American College of Gastroenterology suggests continuing whichever dietary or drug treatment worked, to prevent recurrence (Dellon et al., 2025). Long avoidance has its own risk in some children with food allergy, described in section 6: a new immediate reaction to a food they had been avoiding (Chang et al., 2016). That is why the clinician, not the person, decides how and when a food comes back.

Common variations

The empiric diets for eosinophilic esophagitis come in 1-, 2-, 4- and 6-food versions, and some clinics start with fewer foods and step up only if the first diet does not work (Dellon et al., 2025). Test-directed diets choose foods from skin prick, patch or blood tests. An elemental diet replaces food with formula. Few-foods and oligoantigenic diets have been used for ADHD, migraine and eczema (Bath-Hextall et al., 2008; Egger et al., 1983; Pelsser et al., 2011). The Sydney hospital's diet removes natural food chemicals, salicylates, amines and glutamate, and additives, for suspected food intolerance (Swain et al., 2026). For an exclusively breastfed infant with a suspected food allergy, the suspected food may be removed from the mother's diet (Boyce et al., 2010).

Commercial versions build an elimination list from an IgG or leukocyte test, and several named diets work by removing foods: the Low-FODMAP Diet, the Gluten-Free Diet, Whole30, and the Autoimmune Protocol Diet, Dairy-Free Diet, Specific Carbohydrate Diet, GAPS Diet and Low-Histamine Diet. The gluten-free, casein-free diet tried for children with autism is described on the Gluten-Free Diet page.

3. For the coach

SCOPE OF PRACTICE

A health and wellness coach does not prescribe, adjust, endorse or discourage an elimination diet or any other way of eating, and does not diagnose or treat. The coach helps the client understand what they have chosen, notice how it is going, and decide what to do next. This method sits on the clinical side of the line. Diagnosis belongs to the physician, allergist or gastroenterologist, and the plan, which foods come out, for how long and how they come back, belongs to them and the registered dietitian. A coach never suggests an elimination diet, or a food challenge at home, as a way to find out what a client reacts to.

Clinical evaluation and supervision apply to anyone using an elimination diet to investigate or treat symptoms. The following groups need particular attention, with the appropriate clinician and dietitian involved:

• Symptoms that no clinician has evaluated: the client's physician first, before any food is removed.
• A known or suspected food allergy, above all after a severe reaction: the allergist, who decides whether and how any food is reintroduced.
• A child or teenager: the pediatric clinician and a registered dietitian, because growth and nutrition are at stake.
• Pregnant or breastfeeding: the obstetric or pediatric clinician and a registered dietitian.
• A current or past eating disorder or disordered eating: the client's clinician, through the coach's own referral process or an existing care plan.
• Taking insulin or a sulfonylurea: the client keeps the prescriber informed before a substantial change in eating.
• Taking warfarin: the client keeps the prescriber informed before a substantial change in vitamin K intake.

Food allergy and food intolerance are different things, in the words of the U.S. guidelines. A food allergy is "an adverse health effect arising from a specific immune response that occurs reproducibly on exposure to a given food"; reproducible reactions without an established or likely immune mechanism "are termed food intolerances" (Boyce et al., 2010). The coach uses the client's clinician's words for what the client has and does not relabel it.

Who does what

The physician

Usually a primary care physician first, then an allergist, a gastroenterologist or both. Takes the history and examines the person, rules out conditions that cause similar symptoms, and decides whether an elimination diet is the right tool at all. For a suspected IgE-mediated food allergy, the allergist interprets skin prick and blood IgE tests, which show sensitization but not by themselves whether a food causes reactions, and runs oral food challenges in a medical facility with treatment for a severe reaction on hand (Boyce et al., 2010). For eosinophilic esophagitis, the gastroenterologist makes the diagnosis by endoscopy and biopsy, discusses diet alongside medicines such as acid-suppressing drugs, swallowed steroids and a biologic, and repeats endoscopy to judge each step (Dellon et al., 2025). Prescribes emergency epinephrine where a reaction could be severe, and adjusts any medication that a substantial change in eating affects.

The registered dietitian

Designs the elimination diet, ideally a dietitian with training in food allergy or gastrointestinal conditions. Teaches label reading and replacements, checks what the removed foods were supplying, such as calcium and vitamin D when milk is removed, and plans the reintroduction with the physician. The U.S. guidelines recommend nutritional counseling and regular growth monitoring for all children with a food allergy (Boyce et al., 2010); the European guideline suggests individualized dietary advice, with a registered dietitian for complex patients (Santos et al., 2025); and the American College of Gastroenterology says diet treatment for eosinophilic esophagitis works best with a dietitian who knows the condition, with a feeding therapist involved when a child has feeding problems or avoidant/restrictive food intake disorder (Dellon et al., 2025).

Other professionals

A psychologist or other trained professional, for people with food allergy, and their caregivers, whose distress about food is moderate to severe (Santos et al., 2025). A feeding therapist for a child whose eating has narrowed.

The health and wellness coach

Helps the client get ready for and make use of their clinical care: clarifying what they hope to learn, what they want to ask, and how they will get through the weeks the plan asks for. Helps with the practical habits the clinician's plan depends on, such as planning meals and shopping within the client's budget, packing food for work or school, handling restaurants, travel and family meals, and keeping the appointments that carry the client through reintroduction. Explores how the plan fits the client's values, culture and household. Notices whether eating is widening or narrowing over time, and holds the referral line when a question belongs to a clinician.

What a client bringing this diet needs

Clients arrive at one of a few points. Some have a diagnosis, such as eosinophilic esophagitis or a confirmed milk allergy, and a plan from their clinician, and need help living with it. Some are in reintroduction and are afraid to bring foods back. Some are parents trying to work out whether a food is behind a child's eczema or behavior. And some have bought a test, or read a list online, and are ready to cut a dozen foods on their own. Each needs something different: a steady place to plan, support for using the clinician and dietitian for the parts that belong to them, or a conversation about getting the symptoms evaluated before going further.

What the coaching conversation adds is room to look at the person's whole life around the plan, and to keep the end of it in view. An elimination diet is a question with an answer at the end, and the coach can help a client keep the reintroduction appointments that produce the answer rather than drifting into avoidance that no one planned.

What to ask

• "Who set up this plan with you, and what is it meant to find out?"
• "What did your doctor or dietitian say about how and when foods come back?"
• "How is this way of eating fitting with the people you eat with, your budget and your week?"

Referral red flags

A client who reacts after eating a food, especially one that was being avoided or has just been reintroduced, with hives, swelling of the lips, tongue or throat, wheezing, trouble breathing, vomiting or faintness may be having an allergic reaction. Anaphylaxis is a serious allergic reaction that is rapid in onset and may cause death (Boyce et al., 2010); swelling in the throat or trouble breathing needs emergency help, using the client's own emergency plan and epinephrine if they have them. Any reintroduction of a food that has caused a reaction belongs to the allergist. A client with trouble swallowing or food that sticks needs their clinician, not a change of diet.

A client who has removed foods without any clinical evaluation, or on the strength of an at-home test, goes to their clinician before going further. So does a client who is losing weight without meaning to, a child who is not growing as expected, or a client whose symptoms have not changed after the planned weeks. A client who has stayed in elimination well beyond the plan, who skips reintroduction appointments, or whose list of avoided foods keeps growing is worth asking about it, as described under Signs it is going wrong in section 6.

A client taking insulin or a sulfonylurea who is about to make a substantial change in eating keeps the prescriber informed before making it. A client who reports shakiness, sweating or confusion may be having a low blood sugar episode right now; the first step is the one in their own diabetes plan for treating it, with emergency help if symptoms are severe or the person cannot manage the episode under their plan, and telling the prescriber is the separate step that follows.

Special populations

Pregnancy and breastfeeding

A Cochrane review found that prescribing an antigen avoidance diet during pregnancy to women at high risk of having an allergic child is unlikely to reduce the child's risk substantially, and that the restricted diet was associated with slightly lower gestational weight gain, a nonsignificantly higher risk of preterm birth and a nonsignificantly lower mean birthweight. In lactating mothers of infants with established eczema, 1 crossover trial of 17 mothers found a nonsignificant reduction in the infants' eczema severity when the mothers avoided food antigens (Kramer & Kakuma, 2012). For an exclusively breastfed infant with a suspected food allergy, the U.S. guidelines describe removing the suspected food from the mother's diet or using a hypoallergenic formula until the food is identified (Boyce et al., 2010). Any such change belongs with the obstetric or pediatric clinician and a dietitian.

Children and adolescents

Most of the research on this method is in children, and so are the most important cautions. The U.S. guidelines recommend nutritional counseling and regular growth monitoring for every child with a food allergy, and cite a study in which children with 2 or more food allergies were shorter than those with 1 (Boyce et al., 2010). For ADHD, England's National Institute for Health and Care Excellence advises against recommending removal of artificial colorings and additives as a generally applicable treatment; where a parent sees a clear link between foods and behavior, it suggests a food and behavior diary and, if the diary supports a link, referral to a dietitian, with any elimination managed jointly by the dietitian, a mental health specialist or pediatrician, and the family (National Institute for Health and Care Excellence, 2019). A child's eating belongs to the family and the child's clinicians.

Older adults

The searches for this page found no study of elimination diets designed for older adults. New gut symptoms later in life are a reason for a clinical evaluation before any food is removed, and whether a restricted diet meets an older adult's needs is a question for a dietitian.

Athletes and people with high activity

The searches for this page found no study of elimination diets in athletes. Removing several staple foods while training hard raises questions of energy, carbohydrate and protein that belong to a sports dietitian. Wheat is a known trigger of a rare allergic reaction that occurs only when exercise follows eating, which the Gluten-Free Diet page describes.

People taking medication for diabetes, blood pressure, or blood thinning

The searches for this page found no study of elimination diets and these medicines. Removing whole food groups can substantially change what and how much a person eats. A client on insulin, a sulfonylurea, blood pressure medication or warfarin who plans a substantial change in eating keeps the prescriber informed before making it, rather than asking permission for every food choice. Medicines for eosinophilic esophagitis or for allergy are the prescriber's, and a client who wants to stop one because of a diet takes that to the prescriber.

People with a history of disordered eating

The method's core, removing foods and watching for reactions, has features that can feed restrictive eating, and researchers have looked for it. In a specialty clinic for children with eosinophilic esophagitis, 37 percent of 115 children met criteria for avoidant/restrictive food intake disorder, an eating disorder of restricted eating without concern about weight or shape; the share was 70 percent among those treated with food elimination alone, against 36 percent on medication alone, in a cross-sectional pilot study that cannot say which came first (Murphy et al., 2025). In 79 adults with food allergy, 25 percent screened positive for the disorder (Polloni et al., 2026). For a client with a current or past eating disorder, whether an elimination diet is appropriate is a decision for the clinical team.

Client misconceptions

Three come up most. The first is that a blood test can show which foods to cut. The allergy bodies opened for this page say that food-specific IgG reflects exposure to a food rather than a reaction to it, and they recommend against using it to diagnose food reactions (Carr et al., 2012; Stapel et al., 2008). The second is that feeling better after removing a food proves the food was the cause. An open diet cannot separate the food from expectation and the other changes that come with it, which is why blinded challenges exist and why many suspected foods are tolerated when tested (Boyce et al., 2010).

The third is that removing more foods, for longer, is safer. Long, broad avoidance carries the risks described in section 6, and the European allergy guideline recommends that people keep eating the foods they tolerate (Santos et al., 2025). Each is taken up in section 6.

🤝 COACHING CONNECTION

Dana tells her coach she has had bloating and headaches for months. She bought an at-home food sensitivity test, and it flagged 14 foods, including eggs, wheat, almonds and yogurt. She plans to cut all of them right away. The coach reflects how much she wants an answer and asks what she has noticed about when the symptoms come and go. Dana says they are worse on busy workdays. The coach asks who else knows about the symptoms. Dana says she has not mentioned them to her doctor because a test seemed faster. The coach asks what she would want to happen first. Dana decides to book an appointment and bring the test results with her before changing what she eats. The coach did not evaluate the test, suggest a food to remove, or guess at a cause.

4. The evidence

(select the heading to open or close this section)

Because an elimination diet is a method, the research asks a different question for each use, and each use is reported separately here. The strongest body of evidence is for eosinophilic esophagitis, where guideline panels rate the evidence for diet treatment low to moderate in certainty and randomized trials have compared diets with each other. For diagnosing food allergy, the method is built into guideline practice, with the blinded food challenge as the reference test. For eczema, ADHD, migraine and irritable bowel syndrome, the trials are fewer, smaller, or hard to blind, and the results depend heavily on who rated the outcome. The searches for this page found no trial of an elimination diet that measured cardiovascular events, cancer or death. The ratings are collected in the review record at the end of the page.

Diagnosing food allergy: what the guidelines say

The U.S. food allergy guidelines, written by an expert panel sponsored by the National Institute of Allergy and Infectious Diseases, used the GRADE approach, as applied by the RAND Corporation, to rate the quality of the evidence behind each recommendation as high, moderate or low (Boyce et al., 2010). They suggest that removing 1 or a few specific foods may be useful in diagnosing food allergy, especially for some non-IgE-mediated food allergic disorders, such as food protein-induced enterocolitis syndrome, and for eosinophilic esophagitis, and rate that evidence low; RAND found no studies meeting its criteria for the diagnostic value of elimination trials or food diaries. They recommend oral food challenges for diagnosis, call the double-blind, placebo-controlled challenge "the gold standard," and rate that evidence high.

The same guidelines recommend against avoiding potentially allergenic foods to manage eczema, asthma or eosinophilic esophagitis in people without a documented food allergy, with moderate-quality evidence, because unnecessary avoidance "could place individuals at risk for nutritional deficiencies and growth deficits." And they recommend against a list of nonstandardized tests for evaluating IgE-mediated food allergy that includes allergen-specific IgG4, applied kinesiology and hair analysis (Boyce et al., 2010). These are 2010 recommendations; the European allergy guideline of 2025 covers management after diagnosis and is used on this page for that (Santos et al., 2025).

Clinicians also use targeted elimination and reintroduction in assessing some non-IgE-mediated gastrointestinal food allergies. For a child or young person in whom such an allergy is suspected after an allergy-focused clinical history, England's National Institute for Health and Care Excellence recommends a trial elimination of the suspected allergen, normally for 2 to 6 weeks, then reintroduction, with advice from a dietitian on nutritional adequacy, timing and follow-up. It lists referral to specialist care for situations such as faltering growth with gut symptoms or no response to a single-allergen elimination diet (National Institute for Health and Care Excellence, 2011). That is an individualized clinical diagnosis, not a reason for general avoidance.

The plan, nutritional replacements and reintroduction setting belong to the clinical team and a dietitian. Conditions such as food protein-induced enterocolitis syndrome, in which re-exposure after a period of elimination can bring repeated vomiting and dehydration, require particular care (Boyce et al., 2010); a coach never turns this into a home challenge.

For chronic urticaria, hives that keep returning over a long period, the international urticaria guideline discusses short, clinician-selected diagnostic diets low in pseudoallergens or histamine in some patients, usually for 2 to 3 weeks, while describing the dietary evidence as controversial and warning that such diets should not delay effective treatment (Zuberbier et al., 2026). This does not establish food allergy as the usual cause or justify broad self-directed restriction; the same guideline states that IgE-mediated food allergy is extremely rarely the underlying cause of chronic spontaneous urticaria. Low-Histamine Diet is a separate topic on the archive index.

Evidence from randomized controlled trials

A trial assigns people to the diet by chance and compares them with people assigned to something else, which is the strongest way to test whether the diet itself causes a result. Elimination diet trials share a particular weakness: the person, and usually the family, knows which foods have been removed, so outcomes reported by them can reflect expectation. Trials deal with this by measuring something objective, such as a biopsy read by a pathologist who does not know the group, or by giving the suspected food and a look-alike placebo in a blinded challenge.

Eosinophilic esophagitis

This is the use with the most structured evidence. In 2020 the American Gastroenterological Association Institute and the Joint Task Force on Allergy-Immunology Practice Parameters, using GRADE, suggested 3 dietary approaches over no treatment, each as a conditional recommendation (Hirano et al., 2020). For an elemental formula, the evidence came from 6 single-arm studies in which very few people, 6.4 percent, failed to reach histologic remission, against 86.7 percent in a historical placebo group from steroid trials; the panel rated it moderate quality "due to possible large effects." For the empiric 6-food diet, 10 single-arm studies gave an unweighted response rate of 68 percent, rated low quality because none was a controlled trial. For diets directed by allergy testing, 12 single-arm studies found that 49.2 percent failed to reach remission, rated very low quality.

The American College of Gastroenterology's 2025 guideline, also using GRADE, suggests an empiric food elimination diet as a treatment for eosinophilic esophagitis, with low-quality evidence and a conditional recommendation, and does not suggest using currently available allergy tests to direct food elimination, with very low-quality evidence (Dellon et al., 2025). It explains that the condition is a delayed, lymphocyte-driven allergic inflammation in which IgE is not required, so skin prick, patch and blood IgE or IgG tests have predicted triggers poorly. Its stated reason for the low rating is "heterogeneity of data and lack of placebo-controlled studies."

Two systematic reviews pool the single-arm results. A 2014 review of 33 studies with 1,317 patients found histologic remission in 90.8 percent on elemental diets, 72.1 percent on the 6-food diet and 45.5 percent on allergy test-directed diets (Arias et al., 2014). Its 2024 update, with 43 studies and 2,825 patients, gave 94.5 percent for elemental diets, 63.9 percent for 6-food, 54.7 percent for 4-food, 44.3 percent for 2-food and 46.4 percent for 1-food diets, and 39.5 percent for test-directed diets, with higher rates in children than adults and in retrospective than prospective studies (Arias et al., 2024). These are remission rates within groups, not comparisons with no treatment, and the gap between retrospective and prospective studies is a reason for caution.

The randomized trials compare diets with each other. In the first multicenter trial in adults, 129 adults aged 18 to 60 at 10 U.S. centers were randomized to remove animal milk alone or 6 food groups for 6 weeks. Biopsies were read centrally by pathologists who did not know the group. Histologic remission, fewer than 15 eosinophils per high-power field, occurred in 23 of 67 (34 percent) on the milk-only diet and 25 of 62 (40 percent) on the 6-food diet, a difference of 6 percentage points, 95 percent confidence interval 11 points favoring milk-only to 23 points favoring 6-food. Complete remission was more frequent on the 6-food diet, 19 percent against 6 percent, and symptom and quality of life changes did not differ clearly. Of the 129, 124 completed the study (Kliewer et al., 2023).

That trial was planned to detect a difference of 25 percentage points, from an expected 45 percent on milk alone to 70 percent on 6 foods, and its interval rules out an advantage that large for the 6-food diet, but not a smaller one. Non-responders could move on: 9 of 21 who had not responded to milk elimination responded to the 6-food diet, and 9 of 11 who had not responded to the 6-food diet responded to a swallowed steroid. The authors failed to show that the 6-food diet was superior; that is not proof that the 2 are equal (Kliewer et al., 2023).

In children aged 6 to 17, a multisite trial randomized 63 to a milk-only diet or a 4-food diet for 12 weeks. Symptom scores improved more on the 4-food diet, but histologic remission was similar, 41 percent on 4 foods against 44 percent on milk alone, and 32 percent withdrew from the 4-food diet against 11 percent from milk alone (Kliewer et al., 2025). Only the abstract of that trial was read for this page. A 2026 meta-analysis of 7 studies found a pooled remission rate of 51 percent on the milk-only diet and no clear difference against broader elimination diets, an odds ratio of 1.00, from 0.64 to 1.58; its abstract alone was read (Tsaggaridou & Pitsios, 2026).

Atopic dermatitis (eczema)

A 2022 systematic review with GRADE combined 10 randomized trials with 599 participants, most of them young children, median mean age 1.5 years, with mild to moderate eczema. Compared with no elimination, removing foods may slightly improve eczema severity: 50 percent with elimination and 41 percent without improved by at least the minimal important difference of 8.7 points on the SCORAD severity index, a risk difference of 9 percent, from 0 to 17. Itch and sleeplessness may also improve slightly. The authors rated this evidence low certainty and described the improvement as "slight, potentially unimportant" (Oykhman et al., 2022). Only its abstract was read for this page.

The same review found no credible difference between empiric diets and diets guided by testing, and said that the trials gave too little information on harms, while indirect evidence suggests that elimination diets may increase the risk of developing IgE-mediated food allergy (Oykhman et al., 2022). An older Cochrane review of 9 trials with 421 participants found no benefit of egg and milk exclusion, few-foods diets or elemental diets in unselected people with eczema, and possible benefit of egg exclusion in infants with suspected egg allergy and positive IgE to egg; it cautioned that poor allocation concealment, lack of blinding and high dropout made the trials hard to interpret (Bath-Hextall et al., 2008).

The 2023 joint eczema guideline of the American Academy of Allergy, Asthma and Immunology and the American College of Allergy, Asthma and Immunology (AAAAI/ACAAI) conditionally suggests against using elimination diets to treat atopic dermatitis, compared with an unrestricted diet, on low-certainty evidence, because any small or uncertain benefit must be weighed against burdens and potential harms, including the development of IgE-mediated food allergy, with infants and children thought to be at greater risk (Chu et al., 2024). Its benefit estimate comes from the 2022 review above. Assessment of a suspected food allergy is a separate clinical question; a coach does not propose food removal to test a reaction.

Attention deficit hyperactivity disorder

INCA is an influential early trial; more recent TRACE reports directly compare elimination with an active healthy-diet intervention. In INCA, from the Netherlands and Belgium, children aged 4 to 8 with ADHD were randomized to 5 weeks of a restricted elimination diet, 50 children, or to instructions for a healthy diet, 50 children. Only the assessing pediatrician was masked to group in this phase. On the ADHD rating scale scored by that pediatrician, the diet group's mean score fell 23.7 points more than the control group's, from 18.6 to 28.8. Responders then entered a double-blind challenge phase, and 19 of 30 relapsed after foods were reintroduced, whether the foods were high or low on IgG testing; the authors concluded that prescribing diets on the basis of IgG blood tests "should be discouraged." No harms were reported (Pelsser et al., 2011). Only the abstract was read for this page.

The reviews disagree about what INCA and the older trials mean, and the disagreement turns on blinding. A 2012 meta-analysis found that restriction diets reduced ADHD symptoms with an effect size of 0.29, from 0.07 to 0.53 (Nigg et al., 2012). A 2013 meta-analysis by the European ADHD Guidelines Group found that the effect of restricted elimination diets was statistically clear when ADHD was rated by the people closest to the treatment, but fell to a level that was not statistically clear when the best probably blinded assessment was used, and concluded that better evidence from blinded assessments is needed before these diets can be supported as treatments for core ADHD symptoms (Sonuga-Barke et al., 2013).

A 2017 review of meta-analyses limited to double-blind, placebo-controlled trials judged the average few-foods effect substantial and called for more research; its first author disclosed the franchise interest described in section 2. It reproduces the 2013 probably blinded estimate for few-foods diets as a standardized mean difference of 0.51, from −0.02 to 1.04, with high heterogeneity (I² of 72 percent) across 5 double-blind, placebo-controlled studies, some of which tested blinded food challenges rather than the diet itself (Pelsser et al., 2017). Only the abstracts of the 2012 and 2013 meta-analyses were read, so those figures are attributed to the 2017 review. England's National Institute for Health and Care Excellence does not offer elimination as a general treatment, and reserves specific dietary elimination for children whose food diary supports a link, managed jointly with a dietitian (National Institute for Health and Care Excellence, 2019).

TRACE randomized 165 children aged 5 to 12 at 2 Dutch child psychiatry centers to 5 weeks of elimination or an actively supported healthy diet, and did not establish superiority of elimination on its primary ordinal response outcome, which combined parent and teacher ratings: the odds ratio for a better response category on elimination was 0.68, from 0.39 to 1.19. Allocation was unblinded. A group whose parents preferred usual care, most of whom took ADHD medication, was followed alongside but was not randomized. The one-year report followed initial treatment trajectories in which usual care could be added or substituted; it does not isolate a year-long diet effect. In it, fewer children who started on elimination than on the healthy diet showed partial or full improvement, 47 against 64 percent (Huberts-Bosch et al., 2024, 2025).

Migraine

Three randomized trials have tested elimination diets chosen from IgG antibody tests in adults with migraine. They used different test panels, comparison diets and outcomes, so this page does not pool them, and their results disagree.

In a double-blind crossover trial in Turkey, 35 adults with migraine without aura were enrolled, and the 30 who completed both periods were analyzed. Each ate a 6-week diet excluding their IgG-positive foods and a 6-week diet including them, in random order, with patients and their physician blinded to the test results and the type of diet. Headache days averaged 7.5 in the elimination period against 10.2 in the provocation period, each counted over 6 weeks; the paper gives an interval for each period but not for the difference between them. Attack severity and duration did not change (Alpay et al., 2010). The test screened 266 foods, and 2 of the authors list affiliations with private companies, Vivitro Ltd and Invitalab.

In a community trial in the United Kingdom, 167 volunteers with self-reported migraine-like headaches were randomized to a diet sheet removing their IgG-positive foods, from a 113-food panel, or a sham sheet removing the same number of other foods, matched for difficulty; participants and laboratory staff were blinded. Over the 12-week primary period, 138 gave data, with a median of 19 headache days on the true diet and 20 on the sham diet. The headache rate on the sham diet was 1.15 times the rate on the true diet, from 0.94 to 1.41, a difference that was not statistically clear; at 4 weeks the rate ratio was 1.23, from 1.01 to 1.50 (Mitchell et al., 2011).

In a Chinese single-blind trial, 98 adults with migraine were randomized to remove their IgG-positive foods from a 14-food panel, or IgG-negative foods, for 12 weeks, and 95 completed the questionnaires. Participants, laboratory staff and statisticians were unaware of allocation; the staff member who coded the allocation envelopes also prepared each diet sheet. Table 3 reports falls of 4.2 migraine days on the true diet and 0.9 on the sham diet over 12 weeks. A separate baseline-adjusted model in Table 6, without cytokine adjustment, gives 3.6 fewer days with the true diet, from 1.3 to 5.9 fewer (Zhao et al., 2025). The true diet group also improved more on most migraine questionnaires (Zhao et al., 2025).

A 1983 report described 88 children with severe, frequent migraine treated with oligoantigenic diets, with a double-blind controlled trial in 40 of them of the foods identified on reintroduction (Egger et al., 1983); only its abstract was read, and it does not give the trial's numbers. A 2020 systematic review of diet and migraine in adults, funded by a drug manufacturer, judged the overall quality of evidence low and found that a few small randomized trials of diet interventions had assessed prevention "without strong results" (Hindiyeh et al., 2020).

Irritable bowel syndrome

The diet with the largest evidence base for irritable bowel syndrome is the Low-FODMAP Diet, which has its own page with its own ratings; this page does not repeat that evidence. At least 4 randomized reports have tested elimination guided by laboratory tests against comparison diets: 2 IgG-guided reports and 2 leukocyte-test-guided reports (Ali et al., 2017; Atkinson et al., 2004; Singh et al., 2025; Ukashi et al., 2026).

In a 2004 English trial, 150 outpatients were randomized for 12 weeks to remove the foods to which they had raised IgG antibodies on a 29-food panel, or the same number of other foods; patients and staff were blinded, and 131 gave 12-week data. Scores on a 500-point symptom scale fell 39 points more on the true diet, from 5 to 72, against a 50-point change the authors regard as clinically significant. More people withdrew from the true diet, 24 against 13, mainly because of difficulty following it, and the authors' larger effects among fully adherent patients are not randomized comparisons (Atkinson et al., 2004).

A 2025 multicenter trial also tested an IBS-specific IgG-guided diet against sham elimination and found that more participants met its abdominal-pain response criterion: of 238 people with irritable bowel syndrome randomized at 8 centers, 223 were analyzed, and 59.6 percent on the guided diet against 42.1 percent on the sham diet met it during the 8-week diet (Singh et al., 2025). Its registry record lists Biomerica, the maker of the test, as lead sponsor (Biomerica, 2018); only the abstract and that record were read for this page, so the paper's author disclosures are not reported here. This result concerns a specific assay and diet; it does not validate the consumer panels described in section 2 or diagnose food allergy.

An earlier double-blind trial randomized 58 adults to 4 weeks of leukocyte-test-guided avoidance or a matched diet avoiding test-negative foods. Its abstract reports a 0.86-point greater improvement on the IBS Global Improvement Scale at 4 weeks, from 0.05 to 1.67; adequate relief and quality of life did not differ clearly. This is a different outcome and comparison from the 8-week responder result below, and its full report was not read for this account (Ali et al., 2017).

In a 2026 Israeli double-blind trial in 68 adults, a diet guided by a leukocyte activation test led to a 50-point symptom improvement at 8 weeks in 30 of 35, against 18 of 33 on a sham diet. The test group started with higher symptom scores, which can make a 50-point fall easier, and the trial was funded by Cell Science Systems (Ukashi et al., 2026). The 2 kinds of test measure different things, and this page rates them separately.

The American College of Gastroenterology's 2021 guideline, which predates the 2025 and 2026 trials, does not recommend testing for food allergies and food sensitivities in all patients with irritable bowel syndrome unless there are reproducible symptoms concerning for a food allergy, a consensus recommendation that it states could not be assessed with GRADE. It states that serum IgG panels "have not been validated and cannot be recommended at present," and that results of a leukocyte activation test "are intriguing but need to be confirmed" (Lacy et al., 2021).

Cardiometabolic outcomes

The reviewed trials do not establish effects on cardiovascular events. TRACE measured short-term physical-health outcomes, including blood pressure and heart rate, in children with ADHD; that is a separate, limited question, and the differences it reported were against the nonrandomized usual-care group rather than between the 2 randomized diets (Huberts-Bosch et al., 2024). The searches for this page found no trial of an elimination diet that measured cardiovascular events, blood lipids or blood sugar as outcomes.

Cancer

The searches for this page found no trial of an elimination diet that measured cancer incidence, progression or survival. The studies reviewed here do not establish any effect on cancer in either direction.

Body weight, as measured

Weight was not a main outcome of these trials, and this page reports it only as something a study measured. In the adult eosinophilic esophagitis trial, mean weight fell by 2.2 kg over 6 weeks on the 6-food diet and 1.1 kg on the milk-only diet, a difference that was statistically clear (Kliewer et al., 2023). The American College of Gastroenterology notes that an elemental formula needs monitoring by a dietitian for nutritional deficits and potential weight loss, and that a child's growth along height and weight curves must be assured, with a pediatric dietitian when foods are excluded (Dellon et al., 2025).

Weight a person loses without meaning to is a reason to involve a clinician, and a child who is not growing as expected needs the pediatrician. Neither is a sign that the diet is working.

Mortality

The searches for this page found no trial or cohort study of an elimination diet that measured death from any cause. Nothing in the studies reviewed here establishes an effect on survival in either direction. The guidelines do record that anaphylaxis to food can be fatal, which is why reintroduction after a reaction happens under medical supervision (Boyce et al., 2010).

Eating behavior and wellbeing

Quality of life was measured in some trials. In the adult eosinophilic esophagitis trial, changes in quality of life scores were small and similar on both diets (Kliewer et al., 2023), and in the pediatric trial quality of life scores were similar between the milk-only and 4-food diets (Kliewer et al., 2025). Family quality of life was low in a study of children starting elimination diets for non-IgE-mediated gut allergy (Meyer et al., 2017). The cross-sectional studies of avoidant/restrictive food intake disorder are described under special populations in section 3.

Evidence from long-term prospective cohort studies

A cohort study follows people forward and records what happens to them. The searches for this page found no long-term prospective cohort study of people following an elimination diet that measured cardiovascular disease, cancer, body weight or death. What exists instead are clinic records and cross-sectional surveys, which can describe what happened to patients but cannot show that the diet caused it.

The most important for safety is a retrospective review of 298 children referred to a Chicago allergy clinic for suspected food-triggered eczema. Of the 132 children diagnosed and followed, 25 who had never had an immediate reaction developed one after starting an elimination diet, about 19 percent; 9 of their 31 new reactions were anaphylaxis, and 77 percent were to foods the children had been avoiding (Chang et al., 2016). The paper gives this share as both 18.9 and 19.8 percent in different places; 25 of 132 is 18.9 percent. Its authors conclude that strict elimination diets "need to be thoughtfully prescribed as they may lead to decreased oral tolerance."

The Sydney hospital's report describes 14,119 patients over 48 years: 47.1 percent became free of symptoms within 2 to 6 weeks of the elimination diet, 4.4 percent reported no improvement and 48.5 percent were lost to follow-up, and 3,326 completed its double-blind capsule challenges, in which reactions to the active food chemicals were more frequent than to placebo (Swain et al., 2026). With half the patients lost and no comparison group, this describes a clinic's experience, not the effect of the diet.

Highlighted studies

These 4 studies carry the most weight for understanding the method: the first randomized comparison of 2 elimination diets in adults with eosinophilic esophagitis, an influential early randomized trial of a restricted elimination diet for ADHD, a randomized trial of the IgG-guided diets sold to the public, and the clinic study that measured a harm of long avoidance. Kliewer 2023 was read as the authors' accepted manuscript in PubMed Central, Mitchell 2011 and Chang 2016 as full texts in PubMed Central (Chang as the accepted manuscript), and INCA as its abstract.

On a narrow screen, scroll the table sideways to see every column.

Highlighted studies for Elimination Diets

Study	Design	Sample size	Duration	Finding	The limitation that matters
Kliewer et al., 2023	Randomized, open-label trial at 10 U.S. centers; biopsies read blind	129 adults with eosinophilic esophagitis randomized; 124 completed	6 weeks of randomized diet, then a second phase for non-responders	Histologic remission in 34 percent on milk-only elimination and 40 percent on 6-food elimination, a difference of 6 points, from 11 points favoring milk-only to 23 favoring 6-food; complete remission 6 against 19 percent	Too small to rule out a modest difference between the diets; adults who had not responded to acid-suppressing medicine, at specialist centers. Read as the authors' accepted manuscript
Pelsser et al., 2011, INCA	Randomized trial, open-label first phase with a masked pediatrician, then a double-blind challenge phase in responders	100 children aged 4 to 8 with ADHD	5 weeks of diet, then 4 weeks of challenges	ADHD rating scale score 23.7 points lower on the restricted elimination diet than with healthy-diet instructions; 19 of 30 responders relapsed on challenge, whatever their IgG results	Families knew their group in the first phase, and a later meta-analysis found these diets' effects fell to a level that was not statistically clear with probably blinded ratings; a later trial against an actively supported healthy diet did not show elimination to be better. Read as the abstract only
Mitchell et al., 2011	Randomized, single-blind trial of an IgG-guided diet against a sham diet	167 adult volunteers with migraine-like headaches	12 weeks	Headache days did not differ clearly at 12 weeks: the rate on the sham diet was 1.15 times the rate on the true diet, from 0.94 to 1.41; fewer headache days at 4 weeks	Community volunteers with self-reported headaches; the test laboratory supplied the tests, prepared both diet sheets and gave a small grant, a possible influence on the comparison, though the sheets were matched
Chang et al., 2016	Retrospective chart review at 1 pediatric allergy clinic	298 children referred for suspected food-triggered eczema; 132 diagnosed and followed	Clinic records from 2003 to 2010	25 of the 132 children with no earlier immediate reactions developed new immediate reactions after starting an elimination diet; 9 of their 31 reactions were anaphylaxis, and most were to foods being avoided	No comparison group of children without elimination diets, and practice has changed since these records; it shows that the risk exists, not how large it is

Head to head

The direct comparisons are between elimination diets rather than against other named diets. In eosinophilic esophagitis, removing milk alone and removing 6 food groups produced similar histologic remission in adults over 6 weeks (Kliewer et al., 2023), and removing milk alone and removing 4 foods produced similar remission in children over 12 weeks, with better symptom scores but more withdrawals on 4 foods (Kliewer et al., 2025). Against medication, the American College of Gastroenterology describes 1 trial that randomized 64 children to omeprazole plus a 4-food diet or omeprazole alone for 8 to 12 weeks (Dellon et al., 2025). This page did not identify a randomized comparison of an elimination diet alone with a medicine alone, and in the adult trial, people who did not respond to the 6-food diet were offered a swallowed steroid outside the randomized comparison (Kliewer et al., 2023).

In ADHD, INCA compared the restricted elimination diet with instructions for a healthy diet (Pelsser et al., 2011), and TRACE compared an elimination diet with an actively supported healthy diet; TRACE's usual-care group, most of whom took ADHD medication, was not randomized, so it does not give a randomized comparison with medication (Huberts-Bosch et al., 2024). For irritable bowel syndrome, the comparisons with the low-FODMAP diet, traditional dietary advice and gluten-free eating are on the Low-FODMAP Diet and Gluten-Free Diet pages. The searches for this page did not identify a trial comparing the health effects of a clinician-guided elimination diet with Whole30.

Where the evidence is absent

The searches for this page found no trial or cohort study of an elimination diet that measured cardiovascular events, cancer or death, and no long-term prospective cohort of people following one. They found no study designed for older adults, athletes or people taking diabetes, blood pressure or blood-thinning medication. The pregnancy evidence concerns allergy prevention and infant eczema in a Cochrane review of older trials (Kramer & Kakuma, 2012), not the safety of a broad elimination diet in pregnancy.

For eosinophilic esophagitis, the evidence comparing diet with no treatment comes from single-arm studies and historical controls, and the randomized trials compare diets with each other. For eczema, the review found too little reporting of harms. For ADHD, the older probably blinded estimate is imprecise, running from no effect to a large one, and the newer trial against an active healthy diet did not show elimination to be better. For migraine and irritable bowel syndrome, the test-guided trials are few, mostly small, short, and partly funded or sponsored by test makers. The searches did not identify a study testing whether the elimination diets sold with at-home IgG tests identify foods that cause symptoms when checked against blinded challenges. And nothing reviewed here measured how often people who start an elimination diet without a clinician end up with long-term avoidance, nutrient shortfalls or disordered eating.

5. Mechanisms

(optional reading; select the heading to open or close this section)

This section explains how the method is thought to work in the body. You can skip it. Nothing in the coaching sections depends on it.

Established mechanisms

For an IgE-mediated food allergy, the immune system makes IgE antibodies to a food protein, and on exposure those antibodies trigger a fast reaction that can range from hives to anaphylaxis. Removing the food prevents the reaction, which is why avoidance is the core of management after diagnosis (Boyce et al., 2010; Santos et al., 2025). A positive skin prick or IgE blood test shows sensitization, meaning the antibodies are present, but by itself does not show that eating the food causes a reaction, which is why the challenge is the reference test (Boyce et al., 2010).

Eosinophilic esophagitis works differently. The American College of Gastroenterology describes it as a food antigen-driven, delayed-type, lymphocyte-driven allergic inflammation in which IgE is not required. That is why removing trigger foods can bring remission, and also why allergy tests built on IgE predict its triggers poorly (Dellon et al., 2025).

IgG antibodies to foods have a different meaning again. The European allergy academy's task force concluded that food-specific IgG4 "does not indicate (imminent) food allergy or intolerance, but rather a physiological response of the immune system after exposition to food components" (Stapel et al., 2008), and the Canadian allergy society describes food-specific IgG as "a marker of exposure and tolerance to food" (Carr et al., 2012). A person who eats a food often is expected to have IgG to it.

Proposed mechanisms

Several mechanisms are proposed rather than established. That long avoidance of a food can lead to a loss of tolerance, so that a delayed reaction becomes an immediate one, is suggested by clinic observations and case reports rather than proven (Chang et al., 2016; Hirano et al., 2020). For food intolerance, the Sydney group proposes that natural food chemicals such as salicylates, amines and glutamate trigger symptoms in sensitive people, while noting that the cause and mechanism of food intolerance remain unclear and debated (Swain et al., 2026). For ADHD, the idea that particular foods provoke behavior in some children goes back to Feingold's additive hypothesis (Pelsser et al., 2017). For migraine, one trial proposed that removing IgG-positive foods lowers inflammatory signals, based on changes in blood markers (Zhao et al., 2025).

One more mechanism applies to every open elimination diet: expectation. When a person knows which food has been removed and which has come back, what they notice can be shaped by what they expect, which is why the U.S. guidelines describe the double-blind challenge as reducing the potential bias of patients and of supervising clinicians (Boyce et al., 2010). A proposed mechanism never supports a claim in section 4.

6. Risks, contraindications and myths

(select the heading to open or close this section)

Warnings from professional or regulatory bodies

The professional bodies warn about 2 things: how long and how broadly foods are removed, and how the foods are chosen. On the first, the AGA Institute and Joint Task Force state that "elimination diets of any type should be used with discretion and for as short a period as is suitable to treat the underlying EoE," and that consultation with a board-certified allergist "should be a strong consideration" (Hirano et al., 2020). The U.S. food allergy guidelines report that "prolonged elimination diets that omit multiple foods have been reported to induce severe malnutrition" and require confirmatory diagnostic studies in such cases (Boyce et al., 2010). For eczema, the joint AAAAI/ACAAI guideline suggests against elimination diets, weighing a small, uncertain benefit against harms that include promoting IgE-mediated food allergy (Chu et al., 2024).

On the second, the Canadian Society of Allergy and Clinical Immunology "strongly discourages the practice of food-specific IgG testing for the purposes of identifying or predicting adverse reactions to food," and warns that the test is "being marketed to concerned parents, and may lead to exclusion diets which carry risks of poor growth and malnutrition for their children" (Carr et al., 2012). The European allergy academy's task force concluded that IgG4 testing to foods "should not be performed in case of food-related complaints" (Stapel et al., 2008). The U.S. guidelines list allergen-specific IgG4 among nonstandardized tests not to use for evaluating food allergy (Boyce et al., 2010), and the American College of Gastroenterology states that serum IgG panels "cannot be recommended at present" for irritable bowel syndrome (Lacy et al., 2021). Its 2025 eosinophilic esophagitis guideline does not suggest allergy test-directed elimination (Dellon et al., 2025).

A company selling one of these tests states on its own page that the test "is not a food allergy test," that results should not be used for weight loss, and that because of the nutritional needs of pregnant and breastfeeding women "elimination diets are not recommended" for them (Everlywell, n.d.). Those are the company's statements.

Nutrient gaps

The gaps depend on which foods come out. Milk removal makes calcium and vitamin D harder to get; in a study cited by the U.S. guidelines, children with milk allergy or several food allergies were more likely to eat less calcium than recommended, and the shortfall was less likely when the child had received nutrition counseling (Boyce et al., 2010). Removing several staples at once widens the gaps, and an elemental formula needs monitoring by a dietitian for nutritional deficits and weight loss (Dellon et al., 2025).

The European allergy guideline recommends assessing nutritional adequacy at diagnosis and at review whatever food is excluded, and notes good evidence that individualized dietary counseling improves measures of nutritional status in children with food allergy (Santos et al., 2025). A clinical review notes that restricted diets have caused nutritional deficiencies in children on elimination diets and in adults with inflammatory bowel disease who excluded major food groups (Malone & Daley, 2024). The searches for this page found no current authority that sets nutrient numbers for elimination diets as a group; what replaces each removed food is a question for a registered dietitian.

Who should not follow it without medical supervision

No one should start an elimination diet without a clinician deciding what it is testing, because an elimination diet cannot replace a clinical evaluation (Malone & Daley, 2024). Supervision matters most for anyone with a known or suspected food allergy, especially after a severe reaction, because reintroducing a food can provoke one and challenges belong in a medical facility (Boyce et al., 2010); for children, whose nutrition and growth are at stake (Boyce et al., 2010; Santos et al., 2025); and for people who are pregnant or breastfeeding (Kramer & Kakuma, 2012).

It also matters for anyone with a current or past eating disorder, or with signs of avoidant/restrictive food intake disorder, which is common among children with eosinophilic esophagitis treated by food elimination (Murphy et al., 2025), and for anyone taking insulin, a sulfonylurea, blood pressure medication or warfarin, who keeps the prescriber informed before a substantial change in eating. The special populations list in section 3 is built from these cautions.

Medication interactions

The searches for this page found no medication whose dose is known to change because of an elimination diet itself. The practical issues are indirect. Removing whole food groups can substantially change carbohydrate and vitamin K intake, which matters for people taking insulin, a sulfonylurea or warfarin, and they keep the prescriber informed before such a change. Medicines for the condition being treated, such as acid-suppressing drugs, swallowed steroids or a biologic for eosinophilic esophagitis, or epinephrine for allergy, are decisions for the prescriber, and a client who wants to stop one because of a diet takes that to the prescriber. A coach never adjusts medication; the point of knowing these is to know when to send the client back.

Signs it is going wrong

Physical signs that need the client's care plan, a medical assessment or emergency help include hives, swelling of the lips, tongue or throat, wheezing, trouble breathing, vomiting or faintness after a food, especially one being reintroduced, which call for the client's emergency plan and emergency help if severe; trouble swallowing or food sticking; weight lost without meaning to; a child who is not growing as expected; tiredness or other symptoms that worsen; and symptoms that have not changed after the planned weeks. A client on diabetes medication who reports shakiness, sweating or confusion treats a possible low blood sugar episode first under their own plan, with emergency help if symptoms are severe or the episode cannot be managed, and then tells the prescriber. Each of these is a reason to involve a clinician, not a diagnosis.

Eating behavior needs separate care, because removing foods is the point of the method. What carries meaning is restriction that outlasts its plan: staying in elimination for months, skipping or fearing reintroduction, a list of avoided foods that keeps growing, describing foods as safe and unsafe, or turning down meals with other people. Many of these have ordinary reasons, such as a confirmed allergy, a clinician's plan, a work schedule, food access, cultural or religious practice or household preferences, so a behavior alone tells a coach little. The coach asks what the behavior is for, whether it causes distress, whether it is narrowing what the person eats, and whether it is getting in the way of daily life. Where the answers raise a real concern, the coach follows their own referral process, or brings it to the client's clinician under an existing care plan.

Myths and where they came from

Myth: a blood test can tell me which foods I'm sensitive to

Where it came from: at-home and clinic IgG tests marketed directly to the public, often with elimination diet instructions (Carr et al., 2012; Everlywell, n.d.). What is true: the allergy bodies opened for this page describe food-specific IgG as a sign of exposure to a food, not of a reaction to it, and recommend against using it to diagnose food reactions (Carr et al., 2012; Stapel et al., 2008). In the INCA trial for ADHD, children relapsed on challenge whether the foods were high or low on IgG testing (Pelsser et al., 2011).

Myth: if I feel better after cutting a food, that food was the problem

Where it came from: people's real experience of feeling better, and the logic of the method itself. What is true: an open diet changes several things at once and cannot separate the food from expectation, which is why the blinded challenge is the reference test. When suspected foods were tested blind, only about one third were confirmed (Boyce et al., 2010).

Myth: avoiding more foods, for longer, is the safe choice

Where it came from: the relief of the first weeks, and the idea that a food you do not eat cannot hurt you. What is true: prolonged elimination of several foods has been reported to cause severe malnutrition (Boyce et al., 2010); in children with food-related eczema, new immediate reactions mostly involved foods they had been avoiding (Chang et al., 2016); and the European guideline recommends continuing to eat tolerated foods (Santos et al., 2025).

Myth: an elimination diet is a good way for anyone to find their trigger foods

Where it came from: popular programs and test marketing that present elimination as a general self-test. What is true: in clinical use it starts with a diagnosis or a specific suspected problem, and a clinical review states that it "cannot replace a comprehensive, guideline-directed evaluation" (Malone & Daley, 2024). The Whole30 page examines one program's version of that claim.

7. Key terms

Elimination diet

A clinical method in which a specific food or group of foods is removed for a period and then reintroduced while symptoms are watched, chosen to fit a suspected problem.

Food allergy

In the U.S. guidelines' words, an adverse health effect arising from a specific immune response that occurs reproducibly on exposure to a given food.

Food intolerance

A reproducible adverse reaction to a food without an established or likely immune mechanism, such as difficulty digesting lactose.

Food sensitivity

A popular term for symptoms a person links to a food; the professional bodies opened for this page do not use it as a diagnosis.

IgE and IgG

Two classes of antibody. IgE drives immediate allergic reactions; food-specific IgG is a sign that the immune system has met the food.

Sensitization

Having IgE antibodies to a food on a skin or blood test, which does not by itself mean the food causes reactions.

Oral food challenge

A supervised test in a medical facility in which a food is eaten in increasing doses to see whether it causes a reaction.

Double-blind, placebo-controlled food challenge

A challenge in which neither the person nor the clinician knows whether a dose contains the food or a look-alike placebo.

Eosinophilic esophagitis

A chronic immune-mediated inflammation of the esophagus, driven by food in most people, diagnosed by symptoms and a biopsy showing eosinophils in the esophageal lining.

Histologic remission

In eosinophilic esophagitis, fewer than 15 eosinophils per high-power field on biopsy.

Empiric elimination diet

A diet that removes the foods most often responsible for a condition without testing first, such as the 1-, 4- or 6-food diets.

Elemental diet

A diet in which all food is replaced for a time by an amino acid-based formula.

Few-foods or oligoantigenic diet

A diet narrowed to a short list of foods thought unlikely to cause reactions.

Anaphylaxis

A serious allergic reaction that is rapid in onset and may cause death.

Avoidant/restrictive food intake disorder

An eating disorder of restricted eating, often driven by fear of what eating will cause, without the distorted body image or wish to lose weight seen in anorexia nervosa.

8. Review questions

1. Describe the 3 steps of an elimination diet as clinicians use it. Why does this page treat the reintroduction step as the one that answers the question?
2. For readers who open section 4: in the adult trial comparing milk-only and 6-food elimination for eosinophilic esophagitis, what was measured, after how long, and what did the confidence interval for the difference rule out and not rule out?
3. For ADHD, why do the reviews disagree about restricted elimination diets, and what does the disagreement show about who rates an outcome? What did the TRACE trial's active healthy-diet comparison add?
4. A client tells you an at-home test found 14 foods she is sensitive to, and she plans to cut them all. What do you ask, and where is the referral line? What do the allergy bodies say about the test?
5. Pick one myth from section 6. Explain where it came from and what the evidence shows instead.

9. References

Ali, A., Weiss, T. R., McKee, D., Scherban, A., Khan, S., Fields, M. R., Apollo, D., & Mehal, W. Z. (2017). Efficacy of individualised diets in patients with irritable bowel syndrome: A randomised controlled trial. BMJ Open Gastroenterology, 4(1), Article e000164. https://doi.org/10.1136/bmjgast-2017-000164

Alpay, K., Ertas, M., Orhan, E. K., Ustay, D. K., Lieners, C., & Baykan, B. (2010). Diet restriction in migraine, based on IgG against foods: A clinical double-blind, randomised, cross-over trial. Cephalalgia, 30(7), 829-837. https://doi.org/10.1177/0333102410361404

Arias, A., González-Cervera, J., Tenias, J. M., & Lucendo, A. J. (2014). Efficacy of dietary interventions for inducing histologic remission in patients with eosinophilic esophagitis: A systematic review and meta-analysis. Gastroenterology, 146(7), 1639-1648. https://doi.org/10.1053/j.gastro.2014.02.006

Arias, Á., Tejera-Muñoz, A., Gutiérrez-Ramírez, L., Molina-Infante, J., Lucendo, A. J., & EUREOS Guidelines Committee. (2024). Efficacy of dietary therapy for eosinophilic esophagitis in children and adults: An updated systematic review and meta-analysis. Nutrients, 16(14), Article 2231. https://doi.org/10.3390/nu16142231

Atkinson, W., Sheldon, T. A., Shaath, N., & Whorwell, P. J. (2004). Food elimination based on IgG antibodies in irritable bowel syndrome: A randomised controlled trial. Gut, 53(10), 1459-1464. https://doi.org/10.1136/gut.2003.037697

Bath-Hextall, F., Delamere, F. M., & Williams, H. C. (2008). Dietary exclusions for established atopic eczema. Cochrane Database of Systematic Reviews, 2008(1), Article CD005203. https://doi.org/10.1002/14651858.CD005203.pub2

Biomerica. (2018, March 9). Endpoint determination study for an antibody guided dietary restriction trial using Biomerica InFoods IBS test in patients with a previous diagnosis of irritable bowel syndrome (IBS) (ClinicalTrials.gov Identifier NCT03459482). ClinicalTrials.gov. clinicaltrials.gov/study/NCT03459482

Boyce, J. A., Assa'ad, A., Burks, A. W., Jones, S. M., Sampson, H. A., Wood, R. A., Plaut, M., Cooper, S. F., Fenton, M. J., Arshad, S. H., Bahna, S. L., Beck, L. A., Byrd-Bredbenner, C., Camargo, C. A., Eichenfield, L., Furuta, G. T., Hanifin, J. M., Jones, C., Kraft, M., . . . Schwaninger, J. M. (2010). Guidelines for the diagnosis and management of food allergy in the United States: Report of the NIAID-sponsored expert panel. Journal of Allergy and Clinical Immunology, 126(6, Suppl.), S1-S58. https://doi.org/10.1016/j.jaci.2010.10.007

Carr, S., Chan, E., Lavine, E., & Moote, W. (2012). CSACI position statement on the testing of food-specific IgG. Allergy, Asthma & Clinical Immunology, 8, Article 12. https://doi.org/10.1186/1710-1492-8-12

Chang, A., Robison, R., Cai, M., & Singh, A. M. (2016). Natural history of food-triggered atopic dermatitis and development of immediate reactions in children. Journal of Allergy and Clinical Immunology: In Practice, 4(2), 229-236.e1. https://doi.org/10.1016/j.jaip.2015.08.006

Chu, D. K., Schneider, L., Asiniwasis, R. N., Boguniewicz, M., De Benedetto, A., Ellison, K., Frazier, W. T., Greenhawt, M., Huynh, J., Kim, E., LeBovidge, J., Lind, M. L., Lio, P., Martin, S. A., O'Brien, M., Ong, P. Y., Silverberg, J. I., Spergel, J. M., Wang, J., . . . Chu, D. K. (2024). Atopic dermatitis (eczema) guidelines: 2023 American Academy of Allergy, Asthma and Immunology/American College of Allergy, Asthma and Immunology Joint Task Force on Practice Parameters GRADE- and Institute of Medicine-based recommendations. Annals of Allergy, Asthma & Immunology, 132(3), 274-312. https://doi.org/10.1016/j.anai.2023.11.009

Dellon, E. S., Muir, A. B., Katzka, D. A., Shah, S. C., Sauer, B. G., Aceves, S. S., Furuta, G. T., Gonsalves, N., & Hirano, I. (2025). ACG clinical guideline: Diagnosis and management of eosinophilic esophagitis. American Journal of Gastroenterology, 120(1), 31-59. https://doi.org/10.14309/ajg.0000000000003194

Dwyer, E. (2018, January 15). The 3 steps of the FODMAP diet. Monash FODMAP. monashfodmap.com/blog/3-phases-low-fodmap-diet

Egger, J., Carter, C. M., Wilson, J., Turner, M. W., & Soothill, J. F. (1983). Is migraine food allergy? A double-blind controlled trial of oligoantigenic diet treatment. Lancet, 2(8355), 865-869. https://doi.org/10.1016/s0140-6736(83)90866-8

Everlywell. (n.d.). At-home food sensitivity test. Retrieved October 19, 2026, from everlywell.com/products/food-sensitivity

Hindiyeh, N. A., Zhang, N., Farrar, M., Banerjee, P., Lombard, L., & Aurora, S. K. (2020). The role of diet and nutrition in migraine triggers and treatment: A systematic literature review. Headache, 60(7), 1300-1316. https://doi.org/10.1111/head.13836

Hirano, I., Chan, E. S., Rank, M. A., Sharaf, R. N., Stollman, N. H., Stukus, D. R., Wang, K., Greenhawt, M., Falck-Ytter, Y. T., AGA Institute Clinical Guidelines Committee, & Joint Task Force on Allergy-Immunology Practice Parameters. (2020). AGA Institute and the Joint Task Force on Allergy-Immunology Practice Parameters clinical guidelines for the management of eosinophilic esophagitis. Gastroenterology, 158(6), 1776-1786. https://doi.org/10.1053/j.gastro.2020.02.038

Huberts-Bosch, A., Bierens, M., Ly, V., van der Velde, J., de Boer, H., van Beek, G., Appelman, D., Visser, S., Bos, L. H. P., Reijmers, L., van der Meer, J., Kamphuis, N., Draaisma, J. M. T., Donders, R., van de Loo-Neus, G. H. H., Hoekstra, P. J., Bottelier, M., Arias-Vasquez, A., Klip, H., . . . Rommelse, N. N. (2024). Short-term effects of an elimination diet and healthy diet in children with attention-deficit/hyperactivity disorder: A randomized-controlled trial. European Child & Adolescent Psychiatry, 33(5), 1503-1516. https://doi.org/10.1007/s00787-023-02256-y

Huberts-Bosch, A., Bierens, M., Rucklidge, J. J., Ly, V., Donders, R., van de Loo-Neus, G. H. H., Arias-Vasquez, A., Klip, H., Buitelaar, J. K., van den Berg, S. W., & Rommelse, N. N. (2025). Effects of an elimination diet and a healthy diet in children with attention-deficit/hyperactivity disorder: 1-year prospective follow-up of a two-arm randomized, controlled study (TRACE study). JCPP Advances, 5(1), Article e12257. https://doi.org/10.1002/jcv2.12257

Kliewer, K. L., Abonia, J. P., Aceves, S. S., Atkins, D., Bonis, P. A., Capocelli, K. E., Chehade, M., Collins, M. H., Dellon, E. S., Fei, L., Furuta, G. T., Gupta, S. K., Kagalwalla, A., Leung, J., Mir, S., Mukkada, V. A., Pesek, R., Rosenberg, C., Shoda, T., . . . Rothenberg, M. E. (2025). One-food versus 4-food elimination diet for pediatric eosinophilic esophagitis: A multisite randomized trial. Journal of Allergy and Clinical Immunology, 155(2), 520-532. https://doi.org/10.1016/j.jaci.2024.08.023

Kliewer, K. L., Gonsalves, N., Dellon, E. S., Katzka, D. A., Abonia, J. P., Aceves, S. S., Arva, N. C., Besse, J. A., Bonis, P. A., Caldwell, J. M., Capocelli, K. E., Chehade, M., Cianferoni, A., Collins, M. H., Falk, G. W., Gupta, S. K., Hirano, I., Krischer, J. P., Leung, J., . . . Rothenberg, M. E. (2023). One-food versus six-food elimination diet therapy for the treatment of eosinophilic oesophagitis: A multicentre, randomised, open-label trial. Lancet Gastroenterology & Hepatology, 8(5), 408-421. https://doi.org/10.1016/s2468-1253(23)00012-2

Kramer, M. S., & Kakuma, R. (2012). Maternal dietary antigen avoidance during pregnancy or lactation, or both, for preventing or treating atopic disease in the child. Cochrane Database of Systematic Reviews, 2012(9), Article CD000133. https://doi.org/10.1002/14651858.CD000133.pub3

Lacy, B. E., Pimentel, M., Brenner, D. M., Chey, W. D., Keefer, L. A., Long, M. D., & Moshiree, B. (2021). ACG clinical guideline: Management of irritable bowel syndrome. American Journal of Gastroenterology, 116(1), 17-44. https://doi.org/10.14309/ajg.0000000000001036

Malone, J. C., & Daley, S. F. (2024). Elimination diets. In StatPearls. StatPearls Publishing. ncbi.nlm.nih.gov/books/NBK599543

Meyer, R., Godwin, H., Dziubak, R., Panepinto, J. A., Foong, R. M., Bryon, M., Lozinsky, A. C., Reeve, K., & Shah, N. (2017). The impact on quality of life on families of children on an elimination diet for non-immunoglobulin E mediated gastrointestinal food allergies. World Allergy Organization Journal, 10(1), Article 8. https://doi.org/10.1186/s40413-016-0139-7

Mitchell, N., Hewitt, C. E., Jayakody, S., Islam, M., Adamson, J., Watt, I., & Torgerson, D. J. (2011). Randomised controlled trial of food elimination diet based on IgG antibodies for the prevention of migraine like headaches. Nutrition Journal, 10, Article 85. https://doi.org/10.1186/1475-2891-10-85

Murphy, L. B., Buckley, C., O'Gorman, M., Fitzgerald, S., Muller, A., & Robson, J. (2025). Avoidant and restrictive food intake disorder among children with eosinophilic esophagitis. JPGN Reports, 6(4), 485-492. https://doi.org/10.1002/jpr3.70053

National Institute for Health and Care Excellence. (2011). Food allergy in under 19s: Assessment and diagnosis (NICE Guideline CG116). nice.org.uk/guidance/cg116/chapter/Recommendations

National Institute for Health and Care Excellence. (2019). Attention deficit hyperactivity disorder: Diagnosis and management (NICE Guideline NG87). nice.org.uk/guidance/ng87/chapter/Recommendations

Nigg, J. T., Lewis, K., Edinger, T., & Falk, M. (2012). Meta-analysis of attention-deficit/hyperactivity disorder or attention-deficit/hyperactivity disorder symptoms, restriction diet, and synthetic food color additives. Journal of the American Academy of Child and Adolescent Psychiatry, 51(1), 86-97.e8. https://doi.org/10.1016/j.jaac.2011.10.015

Oykhman, P., Dookie, J., Al-Rammahy, H., de Benedetto, A., Asiniwasis, R. N., LeBovidge, J., Wang, J., Ong, P. Y., Lio, P., Gutierrez, A., Capozza, K., Martin, S. A., Frazier, W., Wheeler, K., Boguniewicz, M., Spergel, J. M., Greenhawt, M., Silverberg, J. I., Schneider, L., & Chu, D. K. (2022). Dietary elimination for the treatment of atopic dermatitis: A systematic review and meta-analysis. Journal of Allergy and Clinical Immunology: In Practice, 10(10), 2657-2666.e8. https://doi.org/10.1016/j.jaip.2022.06.044

Pelsser, L. M., Frankena, K., Toorman, J., & Rodrigues Pereira, R. (2017). Diet and ADHD, reviewing the evidence: A systematic review of meta-analyses of double-blind placebo-controlled trials evaluating the efficacy of diet interventions on the behavior of children with ADHD. PLOS ONE, 12(1), Article e0169277. https://doi.org/10.1371/journal.pone.0169277

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Evidence rating and review record

Each row identifies the method, source, outcome or recommendation, and comparison being rated. Ratings from different tools are not interchangeable. The source is either a named published review or this page's own judgment. The rating in the banner is for this diet's main claimed outcome or recommendation, and the banner names the tool that produced it. A high rating means the research is solid; it does not mean the diet is right for everyone, and it does not mean a coach should recommend it.

The rated outcomes on this page use GRADE, the same 4-level scale as the clinical guidelines you will meet in practice. High means further research is very unlikely to change the conclusion. Moderate means further research may change it. Low means further research is likely to change it. Very low means the conclusion is uncertain. GRADE rates each outcome separately, so a method can be high for one use and very low for another. Recommendations from guideline panels, including the 2010 U.S. food allergy guidelines' 3-level ratings, are in a separate second table. A row marked Not rated is an abstention, not a certainty level, and a row marked provisional awaits a check of a source or a reasoning step named in the row.

Every row is about one use of the method in one population; none is a rating of elimination diets in general, and none applies to people without the condition studied. Ratings from a published review or guideline are reported exactly as published. Ratings marked as this page's own judgment were assigned from the evidence, with every GRADE domain recorded in the reasons.

On a narrow screen, scroll the table sideways to see every column.

Evidence ratings, their sources and reasons

Outcome	Certainty	Who rated it, and for which comparison	Why it is rated this way
Eosinophilic esophagitis: histologic remission after the first elimination course, empiric 6-food elimination diet against no treatment (the banner rating)	Low	GRADE, published: AGA Institute and Joint Task Force guideline (Hirano et al., 2020). Children and adults with eosinophilic esophagitis; 6-food elimination against no treatment, as estimated from historical placebo groups; conditional recommendation.	As published. Ten single-arm studies, unweighted response rate 68 percent; relative risk of failing to reach remission 0.38, from 0.32 to 0.43, against historical placebo controls. The panel rated certainty down because none of the studies was a controlled trial. Read as the authors' accepted manuscript in PubMed Central.
Eosinophilic esophagitis: histologic remission, elemental formula against no treatment	Moderate	GRADE, published: Hirano et al., 2020. Children and adults; elemental diet against historical placebo controls; conditional recommendation.	As published. Six single-arm studies; 6.4 percent failed to reach remission against 86.7 percent of historical placebo groups, relative risk 0.07, from 0.05 to 0.12. The panel rated the evidence moderate "due to possible large effects." Adherence, cost and the need for a feeding tube in some children are listed as harms and burdens.
Eosinophilic esophagitis: histologic remission, allergy test-directed elimination diet against no treatment	Very low	GRADE, published: Hirano et al., 2020. Children and adults; elimination chosen from skin prick, patch or blood IgE tests, against historical placebo controls; conditional recommendation.	As published. Twelve single-arm studies; 49.2 percent failed to reach remission; the panel noted inconsistency from different testing methods.
Eosinophilic esophagitis: histologic remission at 6 weeks, milk-only against 6-food elimination, adults	Low, for whether the 2 diets differ by an important amount	GRADE, this page's own judgment, from 1 randomized trial (Kliewer et al., 2023): 129 adults aged 18 to 60 at 10 U.S. centers, followed for 6 weeks.	Randomized trials start high. Threshold: a difference of 10 percentage points in remission, this page's judgment of an important difference, since no published minimal important difference was found. Not lowered for risk of bias: central randomization, intention-to-treat analysis with withdrawals counted as failures, 124 of 129 completed, and biopsies were read by pathologists unaware of the group; open-label diets matter less for a biopsy count. Inconsistency not assessable with 1 trial, not counted as a deduction. Not lowered for indirectness for adults treated at specialist centers. Lowered 2 levels for imprecision: the difference was 6 points, with an interval from 11 points favoring milk-only to 23 points favoring 6-food, which crosses the threshold in both directions. Publication bias not lowered. Nothing raises it. High minus 2 is Low. The interval does rule out the 25-point advantage the trial was designed to detect.
Eosinophilic esophagitis: histologic remission at 12 weeks, milk-only against 4-food elimination, children	Very low, provisional	GRADE, this page's own judgment, from 1 randomized trial read as its abstract (Kliewer et al., 2025): 63 children aged 6 to 17.	Randomized trials start high. Threshold: 10 percentage points, as above. Lowered 1 level for risk of bias: withdrawal was 32 percent on 4 foods against 11 percent on milk alone, which can bias a comparison of remission, and the abstract does not describe how withdrawals were analyzed or whether outcome assessment was blinded. Inconsistency not assessable with 1 trial. Not lowered for indirectness for children at specialist sites. Lowered 2 levels for imprecision: the abstract reports 41 against 44 percent in 63 children but gives no interval and no denominators, and about 30 children per group is far fewer than the roughly 390 per group a standard calculation (80 percent power) needs to detect a 10-point difference; this is a judgment from the sample size, not a computed interval. Publication bias not lowered. High minus 3 is Very low. Provisional until the full report's denominators, analysis and interval are read.
Atopic dermatitis: eczema severity, dietary elimination against no elimination	Low, provisional	GRADE, published: Oykhman et al., 2022, systematic review of 10 randomized trials with 599 participants, mostly young children with mild to moderate eczema. Follow-up as reported in the trials, not stated in the abstract.	As published: dietary elimination may slightly improve eczema severity, 50 against 41 percent reaching the minimal important difference of 8.7 SCORAD points, risk difference 9 percent, from 0 to 17; the authors call the improvement "slight, potentially unimportant." Only the abstract was read, so the domain reasons are not reported here. Provisional until the full review is read.
ADHD: ADHD symptoms rated by probably blinded assessors in double-blind, placebo-controlled few-foods or restricted elimination studies, children (the older, historical question)	Very low, provisional	GRADE, this page's own judgment, from the 2013 meta-analysis's probably blinded estimate (Sonuga-Barke et al., 2013, read as its abstract), as reproduced in a 2017 review read in full (Pelsser et al., 2017): 5 studies.	Randomized trials start high. Threshold: a standardized mean difference of 0.2 in either direction, conventionally a small effect, this page's judgment. Estimate as reproduced in 2017: 0.51, from −0.02 to 1.04, I² 72 percent. Not lowered for risk of bias: the 2017 review reports that the 2013 analysis gave all 5 studies the maximum score for blinding, so knowledge of the diet is not counted here; the trial reports were not opened. Lowered 1 level for inconsistency: heterogeneity was high within this question, and the 2017 review linked it partly to the type of rater and to whether a study tested the diet or blinded challenges; rater type is counted here only, not again as bias. Lowered 1 level for indirectness: some studies tested blinded food challenges rather than starting the diet. Lowered 1 level for imprecision: the interval runs from a trivial effect to a large one, crossing 0.2, without reaching −0.2. Publication bias not assessable with fewer than 10 studies, not lowered. A disclosed franchise interest is not counted by itself. High minus 3 is Very low. Provisional until the 2013 analysis and trial reports are read.
ADHD: response category combining parent and teacher ratings after 5 weeks, elimination diet against an actively supported healthy diet, children aged 5 to 12	Low, for whether elimination is better by an important amount	GRADE, this page's own judgment, from 1 randomized trial read in full (Huberts-Bosch et al., 2024, TRACE): 165 children at 2 Dutch child psychiatry centers, followed for 5 weeks.	Randomized trials start high. Threshold: an odds ratio of 1.25 for a better response category, or 0.80 in the other direction, this page's judgment of an important relative difference, since no published threshold was found for this composite. Estimate: odds ratio 0.68, from 0.39 to 1.19; below 1 favors the healthy diet. Lowered 1 level for risk of bias: allocation was concealed in sealed envelopes and the analysis was by intention to treat with no dropouts before 5 weeks, but parents, researchers and dietitians knew the allocation, half of the composite came from parents delivering the diet, and parent and teacher ratings diverged more often on elimination. Inconsistency not assessable with 1 trial. Not lowered for indirectness: these are the children the question names. Lowered 1 level for imprecision: the interval runs from an important advantage for the healthy diet to a small advantage for elimination, crossing 0.80; it stays below 1.25, so it excludes an important advantage for elimination on this outcome. Publication bias not lowered. High minus 2 is Low.
ADHD: improvement after 1 year, starting on an elimination diet against starting on a healthy diet, with usual care allowed after 5 weeks	Not rated	This page's own judgment. The 1-year report of the same trial, read in full (Huberts-Bosch et al., 2025).	Not rated: the comparison is between treatment trajectories in which usual care, including medication, could be added or substituted after 5 weeks, so it does not isolate a diet effect, and the report gives a test across 5 response categories, 47 against 64 percent with partial or full improvement, rather than an interval for one difference. Not rated does not mean no effect.
Migraine: headache days over 12 weeks, IgG-guided elimination against a matched sham diet, adults with clinically diagnosed migraine; evidence from community volunteers with self-reported migraine-like headaches	Low, provisional	GRADE, this page's own judgment, from 1 randomized trial read in full (Mitchell et al., 2011): 167 randomized, 138 with 12-week data.	Randomized trials start high. Threshold: 1 fewer headache day per 4 weeks, this page's judgment. The paper's rate ratio is the sham group's rate relative to the true diet's: 1.15, from 0.94 to 1.41. Taking the sham group's median of 20 headache days over 12 weeks as an approximate comparison rate, 20 divided by 1.15 is about 17.4, so the true diet had about 0.9 fewer headache days per 4 weeks, from about 0.4 more (20 divided by 0.94) to about 1.9 fewer (20 divided by 1.41); the conversion is approximate because the paper reports medians. Not lowered for risk of bias: participants and laboratory staff were blinded, a diary kept by a blinded participant is not biased merely because it is self-reported, and multiple imputation for the 29 without 12-week data gave a similar result; the laboratory's preparation of both diet sheets is a possible influence, not an established one, and the sheets were matched. Inconsistency not assessable with 1 trial. Lowered 1 level for indirectness: this row asks about clinically diagnosed migraine, but the trial enrolled volunteers with self-reported migraine-like headaches and some may not have had migraine. Lowered 1 level for imprecision: the interval crosses the 1-day threshold and includes no effect. Publication bias not lowered. High minus 2 is Low. Provisional because the conversion to headache days uses the sham group's median rather than a reported model-based comparison rate.
Migraine: headache days over 6 weeks, IgG-guided elimination against a provocation diet including the same foods, crossover, adults with migraine without aura at a headache clinic	Very low, provisional	GRADE, this page's own judgment, from 1 randomized crossover trial read in full (Alpay et al., 2010): 35 enrolled, 30 analyzed.	Randomized trials start high. Threshold: 1 fewer headache day per 4 weeks, which is 1.5 days over 6 weeks. Estimate: 7.5 against 10.2 headache days over 6 weeks, a difference of about 2.7 days, or about 1.8 per 4 weeks; the paper gives an interval for each period, 6.1 to 8.9 and 8.2 to 12.3, but none for the paired difference, so no interval is computed here. Lowered 1 level for risk of bias: only the 30 of 35 who completed both periods were analyzed, after 5 withdrew during the baseline and first diet periods; patients and their physician were blinded to the test results and diet type, and the authors' company affiliations are noted, not counted by themselves. Inconsistency not assessable with 1 trial. Not lowered for indirectness. Lowered 2 levels for imprecision: 30 participants, and without an interval for the difference the result cannot be compared with the threshold. Publication bias not lowered. High minus 3 is Very low. Provisional because the uncertainty of the paired between-diet difference has not been established from the report's period-specific intervals.
Migraine: migraine days over 12 weeks, an item of a migraine disability questionnaire, IgG-guided elimination against a diet removing IgG-negative foods, adults with migraine at a Chinese hospital	Moderate, provisional	GRADE, this page's own judgment, from 1 randomized trial read in full (Zhao et al., 2025): 98 randomized, 95 analyzed.	Randomized trials start high. Threshold: 1 fewer migraine day per 4 weeks, or 3 over 12 weeks. Estimate: Table 6's baseline-adjusted model without cytokine adjustment gives 3.6 fewer migraine days over 12 weeks, from 1.3 to 5.9 fewer, crossing this row's 3-day threshold. Not lowered for risk of bias: participants, laboratory staff and statisticians were unaware of allocation, and 95 of 98 were analyzed; the staff member who coded the allocation envelopes also prepared each diet sheet, a possible influence, not an established one. Inconsistency not assessable with 1 trial. Not lowered for indirectness. Lowered 1 level for imprecision: the interval includes benefits below and above the 3-day threshold; it excludes no difference. Publication bias not lowered. High minus 1 is Moderate. Provisional because Table 6 does not separately state its model denominator.
Irritable bowel syndrome: symptoms, elimination diet chosen from IgG tests against a sham diet	Not rated, interim	This page's own judgment. Two randomized trials with different tests and outcomes: Atkinson et al., 2004, read in full; Singh et al., 2025, read as its abstract and registry record.	Not rated yet: the 2 trials used different IgG panels and different primary outcomes and time points, a symptom score change at 12 weeks and an abdominal-pain responder criterion over 8 weeks, and the larger, later trial's full report has not been read. A rating waits for that report and for a synthesis of the 2 trials by outcome and time point. Not rated does not mean no effect. This does not support a coach offering testing. Diet evidence for irritable bowel syndrome is on the Low-FODMAP Diet page.
Irritable bowel syndrome: a 50-point fall in symptom score at 8 weeks, elimination diet chosen from a leukocyte activation test against a sham diet, adults with diarrhea-predominant or mixed irritable bowel syndrome	Low	GRADE, this page's own judgment, from 1 randomized trial read in full (Ukashi et al., 2026): 68 adults at 1 Israeli center.	Randomized trials start high. Threshold: a relative risk of 1.25 for meeting the response criterion, this page's judgment. Estimate: 30 of 35 against 18 of 33, relative risk about 1.57, from about 1.12 to 2.21, calculated for this page from the reported counts. Lowered 1 level for risk of bias: participants and the dietitian were blinded and dropouts were counted as non-responders, but the test group started with higher symptom scores, median 390 against 330, which can make a 50-point fall easier; a sensitivity analysis in 49 patients with similar scores pointed the same way but is not a randomized comparison. Funding by Cell Science Systems is a possible route to bias, not counted by itself. Inconsistency not assessable with 1 trial. Not lowered for indirectness. Lowered 1 level for imprecision: the interval crosses 1.25. Publication bias not lowered. High minus 2 is Low. This row rates the 2026 trial's 8-week, 50-point responder outcome only; it does not pool the earlier leukocyte-test trial's different outcome and comparison.
New immediate allergic reactions after starting an elimination diet	Not rated	This page's own judgment. Retrospective chart review in children with food-triggered eczema (Chang et al., 2016), plus case reports noted by a guideline panel (Hirano et al., 2020).	Not rated: there is no comparison group, so the size of the risk caused by elimination cannot be estimated. The study shows that the harm occurs, in 25 of 132 followed children without earlier immediate reactions, and the guidelines treat it as a reason for allergist involvement and short elimination.
Nutritional adequacy and growth during elimination diets	Not rated	This page's own judgment. Guideline statements and cross-sectional studies (Boyce et al., 2010; Santos et al., 2025).	Not rated: the searches found no trial comparing nutrient status or growth with and without an elimination diet. Not rated does not mean safe; the guidelines recommend nutrition counseling and growth monitoring for children with food allergy.
Disordered eating, including avoidant/restrictive food intake disorder, during or after an elimination diet	Not rated	This page's own judgment. Cross-sectional studies in children with eosinophilic esophagitis and adults with food allergy (Murphy et al., 2025; Polloni et al., 2026).	Not rated: cross-sectional studies cannot show whether elimination diets cause disordered eating. Not rated does not mean no effect.
Cardiovascular events, cancer and death	Not rated	This page's own judgment. Comparison: elimination diet against usual eating, any population.	Not rated: the searches for this page found no trial or cohort study of these outcomes. Not rated does not mean no effect or safe.

The second table holds recommendations. The quality or certainty of the evidence behind a recommendation is not the same as certainty about a treatment outcome, and a recommendation's direction, for or against, is not a certainty level. The U.S. food allergy guidelines' labels come from GRADE as applied by RAND on a 3-level scale of high, moderate and low; they are carried exactly as published and are not the 4-level outcome scale.

On a narrow screen, scroll the table sideways to see every column.

Recommendations and the quality of the evidence behind them (not treatment-outcome certainty)

Recommendation	Evidence quality or certainty, as published	Who made it, and on which scale	What the label covers
Eosinophilic esophagitis: empiric food elimination diet as a treatment (suggested)	Low; conditional recommendation	GRADE, published, 4-level scale: American College of Gastroenterology guideline (Dellon et al., 2025). Children and adults; empiric elimination diets of 1 to 6 foods. The recommendation does not name a single comparator.	As published. The guideline gives its reasons as heterogeneity of data and lack of placebo-controlled studies.
Eosinophilic esophagitis: using currently available allergy tests to direct food elimination (not suggested)	Very low; conditional recommendation	GRADE, published, 4-level scale: Dellon et al., 2025.	As published. The guideline explains that skin prick, patch and blood IgE or IgG tests have predicted triggers poorly in this condition.
Atopic dermatitis: elimination diets compared with an unrestricted diet (suggested against), recommendation 13	Low certainty; conditional recommendation against	GRADE, published, 4-level scale: AAAAI/ACAAI Joint Task Force atopic dermatitis guideline (Chu et al., 2024). Patients with atopic dermatitis of any age.	As published. The panel weighed a small, uncertain benefit, from the 2022 review rated in the outcome table, against uncertain harms, including the potential to promote IgE-mediated food allergy, especially in infants and children, and the risk of malnutrition and the burden of strict elimination at all ages. A conditional recommendation against is not a certainty level, and it does not bar clinician-directed management of a confirmed food allergy. Read in the official typeset article-in-press copy, not an issue-paginated version.
Food allergy diagnosis: removing 1 or a few specific foods to help diagnose some non-IgE-mediated food allergies and eosinophilic esophagitis	Low	GRADE as applied by RAND for the U.S. expert panel, published, 3-level scale: Boyce et al., 2010, guideline 10. The rating is for the quality of evidence behind a recommendation, not for an outcome against a comparator.	As published. RAND found no studies meeting its criteria for the diagnostic value of elimination trials or food diaries, and the panel noted a significant contribution of expert opinion.
Food allergy diagnosis: oral food challenges, with the double-blind, placebo-controlled challenge as the gold standard	High	GRADE as applied by RAND, published, 3-level scale: Boyce et al., 2010, guideline 11. Quality of evidence behind a recommendation.	As published. The panel adds that a challenge must be done at a medical facility with onsite supervision and treatment for a severe reaction.
Avoiding potentially allergenic foods to manage eczema, asthma or eosinophilic esophagitis in people without a documented food allergy (recommended against)	Moderate	GRADE as applied by RAND, published, 3-level scale: Boyce et al., 2010, guideline 22. Quality of evidence behind a recommendation against.	As published. The panel cites risk of nutritional deficiencies and growth deficits from unnecessary avoidance, and 2 systematic reviews of dietary exclusion for eczema.

How this archive talks about weight. This page reports what studies measured, including body weight, and does not treat weight change as a goal or as a measure of a diet's success. Weight a person loses without meaning to can be a sign of a health problem, and where it is, the page names it as a reason to see a clinician. People are described the way the study described them.

Last reviewed: Reviewed and approved by James Peth, MS, MPH, PhD, on October 21, 2026, after a combined final review of the fifth batch of 5 archive pages, the repairs it asked for and a targeted recheck. Written October 19, 2026. The test prices were rechecked and unchanged on October 21, 2026. What changed: after the combined final review, this version adds 2 ADHD trial reports comparing elimination with an actively supported healthy diet, a 2025 IgG-guided trial in irritable bowel syndrome, the joint allergy societies' eczema recommendation, a passage on non-IgE-mediated gut allergy and chronic urticaria, and a plainer statement that clinical evaluation applies to anyone using the method. The ADHD, migraine and irritable bowel syndrome ratings were rebuilt as separate questions, each with its threshold, interval and arithmetic, and the recommendations moved to their own table.

What changed in the targeted recheck: the In brief summary now says the ADHD trial did not establish that elimination was better than an actively supported healthy diet. The United Kingdom migraine rating now names clinically diagnosed migraine as its question. The Chinese migraine trial is described with its baseline-adjusted difference between groups, and its rating rose from low to moderate, provisional. The irritable bowel syndrome section adds a 2017 leukocyte-test trial, and the 2026 trial's rating is now low, no longer provisional. Each provisional migraine rating now says why it stays provisional.

Next scheduled review: each year. Pages built on annual guidance are rechecked each year. The eosinophilic esophagitis and food allergy guidelines change often and are checked first.

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Diet Reference Archive | One James

Prepared by James Peth, MS, MPH, PhD

© 2026–2027 One James. All rights reserved.

This page is for education and coaching practice. It is not medical or dietary advice.