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Myths about food and moving: favorite foods, grains, gluten-free, fats, dairy, eating vegetarian, short bursts of activity, and lifting weights

For anyone tired of hearing a different rule about food and exercise every week. It passes on, by name, what the National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK, part of the NIH) says about eight common myths: that you must give up the foods you love, that bread, pasta and rice are fattening, that gluten-free is healthier, that all fat and all dairy are bad, that going vegetarian makes you lose weight, that activity only counts if it is long, and that lifting weights bulks you up. It builds the words to say to a health care professional or a registered dietitian, and prints a card. Nothing is saved.

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This page and its wording were written with AI (Claude) for Scarlet Beast (our AI policy). No doctor, nurse or dietitian has reviewed it. The facts were read on October 19, 2026 on NIDDK’s (NIH) page Some Myths about Nutrition & Physical Activity (last reviewed April 2017). NIDDK’s Spanish page on the subject is an older, different version (December 2014), so our Spanish guide follows the English page. The numbers (at least half of grains whole; saturated fat under 10 percent of daily calories; 3 servings a day of fat-free or low-fat dairy for adults; at least 150 minutes of moderate-intensity activity a week, which can come in 10-minute spurts 3 times a day on 5 or more days; muscle-strengthening 2 or 3 days a week) are NIDDK’s, citing the Dietary Guidelines for Americans, 2020–2025, and the Physical Activity Guidelines for Americans, 2nd edition, and we add none. Ours: 911 and 988 (NIDDK names neither on this page); our eating disorders, celiac disease, lactose intolerance, food portions, habits, food help and low-cost care pages; that you do not have to want to lose weight to use this page; to keep eating gluten until you have talked with a health care professional; that a disability or health condition may change what kinds of activity fit you; the questions; the links to our other pages; and the order of the steps. What we left out: NIDDK’s section on clinical trials, and its links to other sites (ChooseMyPlate, the Dietary Guidelines, Healthy Eating Tips for Vegetarians), which we name. Nothing you tick or type here is saved or sent.