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What to eat on a GLP-1: a diet guide from official sources

Updated Sep 30, 2026. Numbers in brackets link to the source each fact comes from.

There is no special “GLP-1 diet” on the drug labels. Wegovy, Zepbound and Foundayo are each approved for use together with a reduced-calorie diet and more physical activity [1] [2] [3]. Federal guidance and a 2025 expert advisory fill in the details: enough protein, plenty of fluids, and smaller meals while your stomach adjusts. This page describes what those sources say; your prescriber or a registered dietitian can fit it to you.

What the labels say about food and fluids

  • Diet and activity are part of the approved use. All three weight-management labels pair the drug with a reduced-calorie diet and increased physical activity [1] [2] [3].
  • Wegovy tablets have food rules. Take the tablet on an empty stomach in the morning with up to 4 ounces of plain water [4], then wait at least 30 minutes before eating, drinking or taking other pills [5].
  • Foundayo does not. Its label says to take it once a day with or without food [6].
  • Watch your fluids. The Zepbound label warns that dehydration from stomach side effects can lead to kidney injury, and tells patients to take care to avoid fluid loss [7].

The medicine works with the diet, not instead of it

The National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) says weight-management medicines do not replace healthy eating or physical activity and work best alongside a lifestyle program [8]. It adds that, on average, adults who take a prescription weight medicine as part of such a program lose 3% to 12% more of their starting weight after a year than people in the same program without the medicine [9].

What the 2025 expert advisory recommends

In 2025, four professional groups, among them The Obesity Society and the American Society for Nutrition, published a joint advisory on nutrition during GLP-1 treatment [10]. It notes that GLP-1 drugs cut body weight by 5% to 18% in trials, and lists the problems that come with that: stomach side effects, nutrient shortfalls from eating less, loss of muscle and bone, and weight regain when people stop [11]. Its priorities during treatment are managing stomach side effects, preventing nutrient deficiencies, and protecting muscle and bone through strength training and diet, with support from a registered dietitian where possible [12].

Specific points from the advisory:

  • Nausea: smaller, more frequent meals, and avoiding fatty or very high-fiber foods in the first few days of treatment, can help [13].
  • Protein: the general adult recommended daily allowance is 0.8 grams per kilogram of body weight per day [14], and higher targets of 1.2 to 1.6 g/kg/day have been proposed during active weight loss [15]. The advisory says it is unclear which body weight those targets should be based on for people with obesity [16].
  • Constipation: enough fluids and fiber from food are encouraged, though other steps are often needed [17].
  • Exercise: strength training at least 3 times a week plus at least 150 minutes of moderate aerobic activity a week, to protect muscle and bone [18].

What the federal Dietary Guidelines say

The Dietary Guidelines for Americans, 2025-2030, apply to everyone, not only GLP-1 users. They center on real, whole, nutrient-dense foods [19]. Their daily targets include:

Food group Dietary Guidelines target
Protein 1.2 to 1.6 grams per kilogram of body weight per day, from animal and plant sources [20]
Vegetables 3 servings a day [21]
Fruits 2 servings a day [21]
Whole grains 2 to 4 servings a day, with fewer refined carbohydrates [22]

The guidelines also tell Americans to avoid highly processed food [23] and say added sugars are not recommended [24]. The protein range in the guidelines matches the higher range the expert advisory describes for active weight loss [15] [20].

Putting it together

A plate built from these sources has protein at each meal, vegetables and fruit, whole grains in place of refined ones, and water through the day, in portions small enough to sit well while your appetite is low. If you have kidney disease, diabetes, or a history of disordered eating, protein and calorie targets need to be set with your care team; do not change your medicine or your diet plan on your own. For side effects by drug, see GLP-1 side effects compared.

Clinic handouts often add lists of foods to avoid and products to take. The advisory covers some of them. It says alcohol may worsen nausea and acid reflux on GLP-1 treatment and should be kept to a minimum [25]. It advises against refined carbohydrates, sugar-sweetened drinks, red and processed meats, and most fast food, ultra-processed sweets and savory snacks [26]. On supplements, it says vitamin D, calcium, vitamin B12 or a multivitamin can be considered for nutrients a person is at risk of running short on, at suitable doses for that person [27], and it counts micronutrient or protein supplements, as needed, as part of care [28]. Spicy food comes up in Novo Nordisk’s Wegovy FAQ as a question to put to your provider: whether to avoid fatty, greasy or spicy foods [29].

Sources

  1. WEGOVY injection is indicated in combination with a reduced calorie diet and increased physical activity: dailymed.nlm.nih.gov, read Sep 27, 2026.
  2. ZEPBOUND® is indicated in combination with a reduced-calorie diet and increased physical activity: dailymed.nlm.nih.gov, read Sep 27, 2026.
  3. FOUNDAYO™ is a GLP-1 receptor agonist indicated in combination with a reduced-calorie diet and increased physical activity dailymed.nlm.nih.gov, read Sep 27, 2026.
  4. Take WEGOVY tablets orally once-daily on an empty stomach in the morning with water (up to 4 ounces). Do not take with other liquids besides water. dailymed.nlm.nih.gov, read Sep 27, 2026.
  5. After taking WEGOVY tablet wait at least 30 minutes before eating food, drinking beverages or taking other oral medications. dailymed.nlm.nih.gov, read Sep 27, 2026.
  6. Take FOUNDAYO orally once daily, with or without food. dailymed.nlm.nih.gov, read Sep 27, 2026.
  7. Inform patients of the potential risk of acute kidney injury due to dehydration associated with gastrointestinal adverse reactions. Advise patients to take precautions to avoid fluid depletion. dailymed.nlm.nih.gov, read Sep 27, 2026.
  8. Medications don’t replace physical activity or healthy eating habits as a way to lose weight. Studies show that weight management medications work best when combined with a lifestyle program. niddk.nih.gov, read Sep 27, 2026.
  9. On average, after 1 year, adults who take prescription medications as part of a lifestyle program lose 3% to 12% more of their starting body weight than people in a lifestyle program who do not take medication. niddk.nih.gov, read Sep 27, 2026.
  10. Nutritional priorities to support GLP-1 therapy for obesity: a joint Advisory from the American College of Lifestyle Medicine, the American Society for Nutrition, the Obesity Medicine Association, and The Obesity Society pmc.ncbi.nlm.nih.gov, read Sep 27, 2026.
  11. GLP-1s reduce body weight by 5% to 18% in trials, with modestly lower effects in real-world analyses, and multiple demonstrated clinical benefits. Challenges include side effects, especially gastrointestinal; nutritional deficiencies due to calorie reduction; muscle and bone loss; low long-term adherence with subsequent weight regain; and high costs with resulting low cost-effectiveness. pmc.ncbi.nlm.nih.gov, read Sep 27, 2026.
  12. During GLP-1 use, nutritional and medical management of gastrointestinal side effects is critical, as is navigating altered dietary preferences and intakes, preventing nutrient deficiencies, preserving muscle and bone mass through resistance training and appropriate diet, and complementary lifestyle interventions. Supportive strategies include group-based visits, registered dietitian nutritionist counseling, telehealth and digital platforms, and Food is Medicine interventions. pmc.ncbi.nlm.nih.gov, read Sep 27, 2026.
  13. Smaller, more frequent meals and avoiding fatty or high fiber foods during the first few days of treatment can help alleviate symptoms pmc.ncbi.nlm.nih.gov, read Sep 27, 2026.
  14. For the general adult population, the recommended daily allowance for protein is 0.8 g/kg/d pmc.ncbi.nlm.nih.gov, read Sep 27, 2026.
  15. Higher targets, such as 1.2–1.6 g/kg/d, have also been proposed during active weight reduction pmc.ncbi.nlm.nih.gov, read Sep 27, 2026.
  16. For individuals with obesity, it is unclear whether these goals should be based on actual body weight, corrected (adjusted or ideal) body weight, or fat-free mass pmc.ncbi.nlm.nih.gov, read Sep 27, 2026.
  17. Adequate fluids and fiber from foods should be encouraged, although additional strategies are often required. pmc.ncbi.nlm.nih.gov, read Sep 27, 2026.
  18. GLP-1s should be prescribed together with a structured exercise program, aiming for regular strength training at least 3 times weekly plus at least 150 min of moderate-intensity aerobic exercise weekly to preserve muscle and bone mass pmc.ncbi.nlm.nih.gov, read Sep 27, 2026.
  19. The Dietary Guidelines for Americans, 2025-2030 put real, whole, nutrient-dense foods back where they belong: at the center of health. realfood.gov, read Sep 27, 2026.
  20. Every meal must prioritize high-quality, nutrient-dense protein from both animal and plant sources, paired with healthy fats from whole foods such as eggs, seafood, meats, full-fat dairy, nuts, seeds, olives, and avocados. Protein target: 1.2–1.6 grams of protein per kilogram of body weight per day realfood.gov, read Sep 27, 2026.
  21. Vegetables: 3 servings per day. Fruits: 2 servings per day. realfood.gov, read Sep 27, 2026.
  22. Prioritize fiber-rich whole grains and significantly reduce the consumption of highly processed, refined carbohydrates that displace real nourishment. Target: 2–4 servings per day. realfood.gov, read Sep 27, 2026.
  23. For the first time, official U.S. guidance calls on Americans to avoid highly processed food. realfood.gov, read Sep 27, 2026.
  24. Added sugars are not part of eating real foods and are not recommended. realfood.gov, read Sep 27, 2026.
  25. Alcohol use may also worsen nausea and gastroesophageal reflux with GLP-1 therapy and should be minimized pmc.ncbi.nlm.nih.gov, read Sep 28, 2026.
  26. Individuals should be counseled to avoid refined carbohydrates (i.e., refined grains, flour, starches, sugars), sugar-sweetened beverages, red and processed meats, and most fast foods, ultraprocessed sweets, and savory snacks pmc.ncbi.nlm.nih.gov, read Sep 28, 2026.
  27. Dietary supplements can be proactively considered for at-risk nutrients, such as vitamin D, calcium, B12, or a multivitamin-mineral tablet, at appropriate doses and tailored to each person’s needs. pmc.ncbi.nlm.nih.gov, read Sep 28, 2026.
  28. and micronutrient or protein supplementation as needed pmc.ncbi.nlm.nih.gov, read Sep 28, 2026.
  29. Should I avoid fatty, greasy, or spicy foods? wegovy.com, read Sep 28, 2026.

This page reports what official sources say; it is not medical advice. Medical disclaimer.