What to eat on Ozempic and other GLP-1 medications

On a GLP-1 medication you will probably eat much less — so the goal shifts from eating less to eating well. That means enough protein to protect your muscle, small gentle meals to ease side effects, plenty of fluids, and nutrient-dense food so the smaller amount you eat still covers your needs. This is the core of a 2025 joint advisory from the American College of Lifestyle Medicine, the American Society for Nutrition, the Obesity Medicine Association and The Obesity Society, which applies to semaglutide (Ozempic, Wegovy), tirzepatide (Mounjaro, Zepbound) and similar drugs.

Your prescriber is in charge of the medication

Dose, side effects and when to stop are decisions for your doctor; this article is about the food around the medication. Contact your doctor promptly if you have severe or persistent stomach pain, vomiting that stops you keeping fluids down, or signs of dehydration such as very dark urine or dizziness — the advisory notes that dehydration from severe vomiting or diarrhea can harm the kidneys.

Why nutrition matters more, not less

In clinical trials GLP-1 medications lower body weight by about 5–18%, with somewhat smaller results in everyday use. The advisory lists the challenges that come with that: stomach side effects, nutrient shortfalls from eating much less, loss of muscle and bone along with fat, and weight regain — when the medication is stopped, up to two-thirds of the lost weight tends to return within a year. What you eat, and how you move, is how you protect the result.

Protein first: protecting your muscle

When you lose weight quickly, some of it is muscle. The advisory notes that targets of 1.2–1.6 g of protein per kg of body weight a day have been proposed during active weight loss — or, more simply, an absolute target of 80–120 g a day. With a small appetite, that means building every mini-meal around protein and eating it first: eggs, Greek yogurt, cottage cheese, fish, chicken, tofu, lentils, milk or kefir. If you have kidney disease, ask your doctor before raising protein. How much protein you need explains the numbers in more detail.

Protein on its own is not enough. The advisory is explicit that higher protein “is likely inadequate” to preserve muscle without structured strength training — it recommends strength training at least 3 times a week plus at least 150 minutes of moderate aerobic activity.

Easing nausea, constipation and reflux

• Nausea: eat a small breakfast, then small meals every 3–4 hours while drinking enough fluids. In the first days, fatty or very high-fiber foods can make it worse.
• Constipation: fluids plus a gradual increase in fiber from food — prunes and other dried fruit can help.
• Diarrhea: avoid large or high-fat meals.
• Reflux and nausea: keep alcohol to a minimum; it can make both worse.

If a symptom is severe or does not settle, that is a conversation for your doctor, not something to push through.

Nutrients to watch when you eat less

Eating far less makes it easier to fall short. The advisory names iron, calcium, magnesium, zinc and vitamins A, D, E, K, B1, B12 and C as nutrients of concern. The first step is variety — vegetables, fruit, dairy or fortified alternatives, fish, legumes, nuts and whole grains. The advisory also says supplements such as vitamin D, calcium, B12 or a multivitamin can be considered for at-risk nutrients; ask your doctor which ones you need and in what dose.

A sample day of small meals

This shows the rhythm — small, protein-led meals every few hours — not exact portions.

• Breakfast (small): plain Greek yogurt with a few berries.
• Mid-morning: a boiled egg, or a glass of milk or kefir.
• Lunch: a palm-sized portion of chicken or tofu, soft-cooked vegetables and a little rice.
• Afternoon: cottage cheese with fruit, or a smoothie made with milk and yogurt.
• Dinner: baked fish, steamed vegetables and a small potato.
• Through the day: water in small sips; clear broth if appetite is very low.

Planning for after the medication

Weight regain after stopping is common, even with nutrition counseling. The habits you build now — protein at every meal, regular strength training, structured meals and enough fiber — are the part you keep. Plan any change in treatment with your doctor rather than stopping on your own.

Frequently asked questions

How much protein should I eat on Ozempic?

The 2025 joint advisory notes that 1.2–1.6 g per kg of body weight a day has been proposed during active weight loss, or an absolute target of 80–120 g a day. If you have kidney disease, check with your doctor first.

What should I avoid eating on a GLP-1?

There's no strict ban list, but large meals and fatty, greasy food tend to worsen nausea and diarrhea, and alcohol can worsen nausea and reflux. Sugary drinks add calories without the protein and nutrients you need.

Why am I constipated on semaglutide?

GLP-1 medications slow the emptying of your stomach and you eat less, which can slow digestion. Drink enough fluids and increase fiber from food gradually — prunes can help. If it's severe or lasts, talk to your doctor.

Do I need vitamins on a GLP-1?

Eating much less raises the risk of shortfalls in nutrients such as iron, calcium, vitamin D and B12. The advisory says supplements can be considered for at-risk nutrients — ask your doctor which ones and at what dose.

Will I regain the weight if I stop?

It's common: studies show up to two-thirds of lost weight can return within a year after stopping. Protein, strength training and steady meal habits help you keep more of the result; plan any change with your doctor.

This article is educational and not medical advice. GLP-1 medications are prescription drugs; decisions about dose, side effects and stopping belong with your doctor.