The short version
About 5 servings of fruits and vegetables a day (2 fruit, 3 vegetables) is linked to about 13% lower risk of death. More than that wasn't linked to further benefit, and potatoes, fruit juice, and starchy vegetables weren't linked to benefit at all (Wang et al., 2021).
Color variety itself has never been tested directly. It's a good cue, not the evidence.
Frozen, dried, and canned produce with little or no added sugar count (Dietary Guidelines for Americans 2025–2030).
Some nutrients that help in food cause harm as pills. The USPSTF (2022) recommends against beta-carotene and vitamin E supplements to prevent heart disease or cancer.
What the evidence supports: amount and type
The strongest data come from Wang et al. (2021), who followed 66,719 women and 42,016 men in 2 large US cohorts and then pooled 26 cohort studies covering about 1.9 million people. Compared with 2 servings a day, about 5 servings was linked to 13% lower all-cause mortality, 12% lower cardiovascular mortality, and 10% lower cancer mortality. Intake above 5 servings wasn't linked to any added reduction.
Type mattered. Most fruit and vegetable subgroups were linked to lower mortality, but starchy vegetables such as peas and corn, fruit juices, and potatoes were not. These are observational findings, so they show a link, not proof of cause. Still, they're consistent and large.
The Dietary Guidelines for Americans 2025–2030 line up with this: for a 2,000-calorie pattern, 3 servings of vegetables and 2 of fruit a day, with 100% juice in limited portions. The guidelines also say "eat a variety of colorful, nutrient-dense vegetables and fruits," and that frozen, dried, or canned options with no or very limited added sugars "can also be good options."
So the rainbow has federal backing as advice. What it doesn't have is a trial showing that eating more colors, holding amount constant, improves health.
The rainbow, corrected
Color is a rough signal for different plant compounds. A few popular pairings need fixing.
Orange and yellow (beta-carotene). The NIH Office of Dietary Supplements (ODS) lists the top provitamin A sources as a baked sweet potato (1,403 mcg RAE), ½ cup of boiled frozen spinach (573 mcg RAE), and ½ cup of raw carrots (459 mcg RAE), followed by cantaloupe, red peppers, and mango. Oranges and strawberries aren't on the list. And notice that spinach, a green food, is one of the richest sources. Color doesn't map neatly onto nutrients.
Green (lutein). Lutein and zeaxanthin are not vitamin A precursors, and their documented role is in the eye. In AREDS2, adding lutein and zeaxanthin to an eye supplement formula for people with age-related macular degeneration gave no extra benefit overall, but it lowered the risk of advanced disease by 26% in people who ate the least of these compounds (ODS). Claims that lutein protects skin from sun damage aren't well supported.
Blue and purple (anthocyanins). Xu et al. (2021) pooled 44 trials and 15 cohort studies. Anthocyanin-rich berries lowered C-reactive protein, a marker of inflammation, by a small amount (about 0.05 mg/dL) and didn't change blood pressure. In the cohort studies, higher anthocyanin intake was linked to lower cardiovascular risk. That's small, early evidence, not a reason to call berries "anti-inflammatory foods."
Antioxidants. Antioxidants are often given as the main reason to eat produce. It's better to point to the outcome data above, which don't depend on any single compound.
Food first: when the pill doesn't match the plate
Beta-carotene is the clearest example of a nutrient that behaves differently as a pill. ODS summarizes 2 large trials in smokers. In CARET, about 18,300 current and former smokers and asbestos-exposed workers took 30 mg of beta-carotene with vitamin A; lung cancer rose 28% and lung cancer deaths rose 46%. In ATBC, about 29,100 male smokers took 20 mg a day; lung cancer rose 18%.
The USPSTF (2022) reviewed supplements for preventing heart disease and cancer in healthy, nonpregnant adults. It recommends against beta-carotene and vitamin E, and found the evidence insufficient to judge multivitamins and most other single nutrients. That recommendation doesn't cover people with a known deficiency or people who are pregnant or could become pregnant, for whom the USPSTF recommends folic acid. Supplements have real uses. Deciding on them is a clinician's job.
Using it with clients
Color works well as a curious, nonjudgmental opener because it's concrete and easy to notice. It also keeps the conversation away from "good" and "bad" foods.
"What colors showed up on your plate this week?"
"You'd like more vegetables, and fresh ones keep going bad before you get to them."
"Would it help to hear what the federal guidelines say about frozen and canned produce?"
"What's got you thinking about a multivitamin?"
Build on what the client already eats and enjoys. If they're interested in more produce, help them explore what's realistic: what their store carries, how much time they have to cook, what their household will eat, and what fits the budget. Frozen and canned produce are often the most practical answer, and you can share that from the Dietary Guidelines. If money or food access is tight, connecting the client to community food resources is part of the work. The client decides what to try; you don't hand over a list or a plan.
When a client asks about a supplement, get curious about what they hope it will do, then point them to the right person.
Where coaching stops
Coaches don't recommend supplements or doses, and don't design eating plans. A client who asks whether to take a multivitamin, beta-carotene, or any other supplement should talk with their physician, pharmacist, or registered dietitian, especially if they smoke, are pregnant, or take medications. A client who needs a diet for a medical condition goes to a registered dietitian.
Go deeper
The Food as Medicine for Health Coaches package from One James is in development and will cover produce prescriptions and coaching when money and food access are tight.
References
National Institutes of Health, Office of Dietary Supplements. (2025). Vitamin A and carotenoids: Fact sheet for health professionals. https://ods.od.nih.gov/factsheets/VitaminA-HealthProfessional/
U.S. Department of Health and Human Services & U.S. Department of Agriculture. (2026). Dietary guidelines for Americans, 2025–2030. https://cdn.realfood.gov/DGA.pdf
U.S. Preventive Services Task Force. (2022). Vitamin, mineral, and multivitamin supplementation to prevent cardiovascular disease and cancer: Preventive medication. https://www.uspreventiveservicestaskforce.org/uspstf/recommendation/vitamin-supplementation-to-prevent-cvd-and-cancer-preventive-medication
Wang, D. D., Li, Y., Bhupathiraju, S. N., Rosner, B. A., Sun, Q., Giovannucci, E. L., Rimm, E. B., Manson, J. E., Willett, W. C., Stampfer, M. J., & Hu, F. B. (2021). Fruit and vegetable intake and mortality: Results from 2 prospective cohort studies of US men and women and a meta-analysis of 26 cohort studies. Circulation, 143(17), 1642–1654. https://doi.org/10.1161/CIRCULATIONAHA.120.048996
Xu, L., Tian, Z., Chen, H., Zhao, Y., & Yang, Y. (2021). Anthocyanins, anthocyanin-rich berries, and cardiovascular risks: Systematic review and meta-analysis of 44 randomized controlled trials and 15 prospective cohort studies. Frontiers in Nutrition, 8, 747884. https://doi.org/10.3389/fnut.2021.747884
