On a GLP-1 medicine such as Wegovy, Ozempic (semaglutide), Zepbound or Mounjaro (tirzepatide), the best way to eat is small, regular meals that start with protein, add fiber gradually and come with steady fluids through the day. Morning's starting targets are 1.4 g of protein per kg of body weight a day, 25 g of fiber for women and 35 g for men, and about 30 ml of water per kg, kept between 2 and 3 liters. A 2025 joint advisory from four US nutrition and obesity societies backs this pattern: protein-rich, minimally processed food, small meals, enough fluids, little alcohol, and strength training alongside.
Key takeaways
- Protein comes first. The 2025–2030 Dietary Guidelines for Americans suggest 1.2 to 1.6 g per kg of body weight a day; Morning uses 1.4 g, the middle of that range. For a 180 lb (82 kg) person, that is about 115 g a day.
- The 2025 joint advisory on GLP-1 nutrition suggests eating the protein part of your meal first, so it gets eaten before you feel full.
- Fiber helps with constipation, but add it slowly. Morning's targets are 25 g a day for women and 35 g for men.
- Water: about 30 ml per kg of body weight, kept between 2 and 3 liters (roughly 68 to 101 oz). Vomiting or diarrhea can dehydrate you fast, and the labels warn that dehydration can harm the kidneys.
- Greasy and fried food, large meals and alcohol often make nausea, reflux or diarrhea worse. The advisory recommends minimal alcohol.
- Small meals every 3 to 4 hours can break the cycle where nausea stops you eating and an empty stomach makes nausea worse.
How much protein do you need on a GLP-1?
Most adults on a GLP-1 do well aiming for about 1.2 to 1.6 g of protein per kg of body weight a day, and Morning's default is 1.4 g. That range comes from the 2025–2030 Dietary Guidelines for Americans, and the 2025 joint advisory notes that targets of 1.2 to 1.6 g per kg have been proposed during active weight loss.
Why it matters: when you eat a lot less, protein is the easiest thing to under-eat, and some of the weight lost on any diet or medicine is lean mass. Protein, together with strength training, helps you hold on to muscle. The advisory is clear that protein alone is not enough; it works best with a regular resistance routine. Our muscle loss guide explains why.
Some practical notes from the advisory:
- If you live in a larger body, using your full body weight can overestimate how much protein you need. The advisory mentions a simple fixed target of 80 to 120 g a day as an alternative that is easier to stick to.
- Very high intakes, at or above 2 g per kg for long periods, should be avoided.
- If you have kidney disease, talk with your clinician before raising protein.
The protein calculator turns your weight into a daily number and a per-meal target, a good starting point to bring to your clinician or dietitian.
Which protein foods are easiest on a GLP-1?
Soft, compact protein foods are usually the easiest, because they deliver a lot of protein in a small volume. The advisory names fish, eggs, Greek yogurt, cottage cheese, and nuts and seeds, including peanut or almond butter. It also encourages beans, peas, lentils, dairy, seafood and lean poultry, and suggests keeping red and processed meats moderate.
When appetite is low, protein shakes, smoothies made with yogurt or milk, and soups can be easier than a plate of meat or hard cheese. Shakes and bars are fine tools when food is hard to face.
How much fiber should you eat, and how fast?
Aim for about 25 g of fiber a day if you are a woman and 35 g if you are a man, building up slowly. These targets sit within the US reference intakes from the National Academies, which range from 21 to 25 g for women and 30 to 38 g for men depending on age.
Fiber feeds regular bowel movements, and constipation is common on GLP-1 medicines. Still, the advisory suggests going easy on high-fiber foods in the first few days of treatment and then increasing them gradually, so your gut can adjust. Good sources include beans and lentils, oats, berries, pears, apples, prunes and other dried fruit, vegetables, chia seeds and whole grains. Drink more fluid as you add fiber.
The fiber calculator shows your target and how close common foods get you.
How much water should you drink on a GLP-1?
A simple rule is about 30 ml of water per kg of body weight a day, kept between 2 and 3 liters. That is the rule the water calculator uses. For example, a 150 lb (68 kg) person lands at about 2 liters, and a 220 lb (100 kg) person at 3 liters.
GLP-1 medicines quiet thirst as well as hunger, so many people drink less without noticing. The advisory warns that dehydration from severe nausea, vomiting or diarrhea can cause acute kidney injury, and the Wegovy and Zepbound labels carry the same warning. Sip through the day rather than drinking a lot with meals, since a big glass at the table can make you feel full faster.
If you cannot keep fluids down, feel dizzy or light-headed, or are peeing much less than usual, contact your clinician or seek care. Severe dehydration needs prompt treatment.
How big should meals be on a GLP-1?
Smaller than you are used to. The advisory recommends regular, small meals at consistent times and avoiding large meals, since vomiting is more likely after a big meal. Nausea often shows up in the morning or after long gaps without food, so a small breakfast and then a small meal or snack every 3 to 4 hours can help.
A few habits that make small meals work:
- Start with the protein on your plate, then vegetables, then starches.
- Eat slowly and stop at the first sign of fullness. Fullness arrives later and stronger on a GLP-1.
- If you forget to eat, set a reminder. Long gaps can make nausea worse.
What to eat when you have no appetite or feel nauseous
On low-appetite or queasy days, choose small, plain, cool or soft foods, and keep protein in the mix where you can. The advisory notes that foods that flow easily and have a high water content tend to leave the stomach faster, and it mentions ginger or peppermint tea.
Foods that often sit well:
- Greek yogurt, cottage cheese or a protein shake
- Eggs, scrambled or boiled
- Broth-based soups, with chicken, beans or tofu
- Plain crackers, toast or rice in small amounts
- Banana, applesauce, melon, berries
- Ginger or peppermint tea, sipped slowly
If nausea stops you eating or drinking for a day or more, tell your clinician. Severe stomach pain that will not go away, especially pain that spreads to your back, can be a sign of pancreatitis; pain in the upper right belly, fever or yellowing skin or eyes can be a gallbladder problem. Seek care right away for either.
Which foods make GLP-1 side effects worse?
Greasy, fried and very rich foods are the most common triggers, along with large meals and alcohol. The advisory suggests limiting high-fat meals for diarrhea and nausea, and minimizing alcohol because it can worsen nausea and reflux on GLP-1 therapy.
| Often makes things worse | Why | Try instead |
|---|---|---|
| Fried food, fast food, creamy sauces | Fat slows the stomach even more; linked to nausea and diarrhea | Grilled, baked or poached protein |
| Very sweet foods and sugary drinks | The advisory lists added sugars and sugar-sweetened drinks among foods to limit | Fruit, plain yogurt with berries |
| Carbonated drinks | Many people find the fizz adds to bloating and burping | Still water, herbal tea |
| Alcohol | Can worsen nausea and reflux | Alcohol-free drinks, tea |
| Large meals | Vomiting is more likely after big meals | Half portions, more often |
Everyone's triggers are a little different. Noticing which meals sit badly, especially around your shot day, is more useful than any list.
What does a day of eating on a GLP-1 look like?
Here is one simple example of small meals built around protein. Portions depend on your appetite; there is no need to finish a plate.
- Breakfast: scrambled eggs with spinach and a slice of whole-grain toast.
- Mid-morning: Greek yogurt with berries and a spoon of chia seeds.
- Lunch: chicken and vegetable soup with beans.
- Afternoon: an apple with peanut butter, or a protein shake on a low-appetite day.
- Dinner: baked salmon, roasted vegetables and a small serving of brown rice or quinoa.
- Through the day: water or herbal tea in small sips.
A GLP-1 grocery list
A short list of easy, protein-forward basics covers most days.
| Category | Good picks |
|---|---|
| Protein | Eggs, chicken breast, turkey, salmon, canned tuna, tofu, shrimp |
| Dairy | Greek yogurt, cottage cheese, milk or unsweetened soy milk, string cheese |
| Beans and legumes | Black beans, lentils, chickpeas, edamame |
| Vegetables | Spinach, broccoli, carrots, zucchini, frozen mixed vegetables |
| Fruit | Berries, bananas, apples, pears, prunes |
| Whole grains | Oats, whole-grain bread, brown rice, quinoa |
| Nuts and seeds | Almonds, peanut butter, chia seeds |
| Easy days | Broth, plain crackers, protein shakes, ginger or peppermint tea |
How Morning helps
Snap a photo of a meal and Morning's food scan counts the protein, fiber and water toward your daily targets, so you can see at a glance where the day stands. Side-effect check-ins show whether nausea or constipation cluster around your shot day, which makes it easier to spot food triggers. Ask Sunny, your chat coach, can suggest gentle meals for a queasy day, and the 30-day Academy covers eating on a GLP-1 in short lessons.
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Questions
What should I eat first on a GLP-1?
Eat the protein on your plate first. The 2025 joint advisory on GLP-1 nutrition suggests this so that protein gets eaten before fullness sets in, which helps protect muscle.
How much protein should I eat on Wegovy or Zepbound?
The 2025–2030 Dietary Guidelines suggest 1.2 to 1.6 g per kg of body weight a day, and Morning starts at 1.4 g. If you live in a larger body or have kidney disease, a dietitian or your clinician can help set a target that fits you.
Can I drink alcohol on a GLP-1?
The 2025 advisory recommends minimal alcohol, because it can worsen nausea and reflux on GLP-1 therapy. Talk with your clinician about what is right for you.
What should I eat when I feel nauseous on a GLP-1?
Small, plain, soft foods such as yogurt, eggs, broth-based soup, crackers or a banana, eaten slowly, with fluids sipped through the day. If you cannot keep food or fluids down, contact your clinician.
Should I take a fiber supplement?
Food comes first, added gradually. The advisory says fiber supplements may help with constipation when food is not enough, so ask your clinician or pharmacist which one suits you.
Do I need to count calories on a GLP-1?
Most people do better focusing on protein, fiber, fluids and small meals than on calories. The advisory does flag that very low intakes make it harder to get enough vitamins and minerals, so a dietitian check-in is worth it if you are eating very little.
Sources
- Mozaffarian D, et al. 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. American Journal of Clinical Nutrition, 2025;122:344–367 (also published in Obesity). doi.org/10.1016/j.ajcnut.2025.04.023
- The Obesity Society. Nutritional priorities to support GLP-1 therapy for obesity. obesity.org
- US Departments of Agriculture and Health and Human Services. Dietary Guidelines for Americans, 2025–2030. cdn.realfood.gov/DGA.pdf
- American Academy of Family Physicians. Dietary Guidelines for 2025–2030: recommendations from the USDA and HHS. American Family Physician, 2026. aafp.org
- National Academies. Dietary Reference Intakes for Energy, Carbohydrate, Fiber, Fat, Fatty Acids, Cholesterol, Protein, and Amino Acids. 2005. nap.nationalacademies.org
- Wegovy (semaglutide) prescribing information, FDA. DailyMed
- Zepbound (tirzepatide) prescribing information, FDA. DailyMed
Keep reading
Educational information, not medical advice. Talk to your clinician about your treatment.