Practical guide

What should you eat on a GLP-1?

8 min read Updated August 2026 US-licensed providers

The short answer

Protein first, then fibre, then everything else, in smaller and slower meals. Appetite suppression shrinks how much food fits in a day, so what you do eat has to earn its place. Very fatty, greasy, and very sweet foods, large portions, and alcohol are the most common triggers for nausea. Fluids matter more than people expect. Your provider sets your targets.

Why eating changes, and why protein goes first

GLP-1 medications slow how quickly your stomach empties and act on appetite regulation, which is exactly what you are paying for. The side effect of that success is arithmetic: the total volume of food you can comfortably eat in a day drops, sometimes sharply, and it drops before your nutritional needs do.

Two things get squeezed first, and they are the two you can least afford to lose:

Protein. It is the most filling macronutrient, which is helpful, and it is bulky, which is not. A portion of chicken that was easy before can now feel like too much halfway through, so daily protein quietly falls at exactly the point where protecting lean mass matters most.
Fibre. Vegetables, legumes, and whole grains take up space and slow digestion further, so they are often the first thing people abandon. Losing them at the same time as eating and drinking less is how constipation starts.

Everything below follows from that. The goal is not a diet, it is getting the important things into a smaller container. Why protein specifically carries so much weight here is covered on do GLP-1s make you lose muscle.

So protein goes first, at every meal. The single most useful habit is sequencing. Eat the protein on the plate first, while you have room for it, then the vegetables, then the starch. If you get full partway through, you have lost the part that mattered least.

Spread it across the day. Three smaller protein servings land better than one large one, because a large one is the meal most likely to sit heavily.
Aim for a target, not a vibe. Many clinicians aim for roughly 1.0 to 1.5 grams of protein per kilogram of body weight per day during active weight loss. Your provider should set your number.
Liquid protein counts on hard days. A shake, Greek yoghurt, cottage cheese, kefir, or a soup with protein in it goes down when a plate of chicken will not.
Track it for one week, once. Almost everyone who is worried about muscle loss discovers they are eating far less protein than they assumed. You only need to do this long enough to recalibrate.
Do not skip a meal because you are not hungry. Not being hungry is the medication working. Eating nothing all day is not the goal and it is the fastest route to fatigue and under-eating protein.

Protein targets are not universal. Anyone with kidney disease, liver disease, a history of an eating disorder, diabetes, or who is pregnant or planning a pregnancy needs an individual target set by a provider or a registered dietitian, not a number from an article. Say what applies to you at your consult.

Foods that are usually easier, and foods that commonly cause trouble

Tolerance is individual, and the only real test is your own. That said, the pattern people report is consistent enough to be worth starting from, particularly in the days after a dose step when your stomach is least forgiving:

Category	Usually easier tolerated	Commonly troublesome
Protein	Chicken, turkey, white fish, eggs, Greek yoghurt, cottage cheese, tofu, protein shakes	Large steaks, fatty cuts, fried chicken, breaded and battered protein
Starches	Rice, potatoes, oats, plain pasta, toast, crackers	Heavy pastry, garlic bread, anything deep fried, very large portions of anything
Vegetables and fibre	Cooked or roasted vegetables, soups, peeled fruit, smaller portions of beans and lentils	Large raw salads, big servings of cruciferous vegetables, a sudden jump in fibre
Dairy	Yoghurt, kefir, hard cheese in small amounts	Cream sauces, milkshakes, large amounts of soft cheese
Fats	Olive oil, avocado, nuts in small measured amounts	Fried food, takeaways, creamy and greasy dishes, which are the most reported nausea trigger
Sweet things	Small portions with a meal rather than alone	Very sweet foods and drinks on an empty stomach, which commonly bring on nausea
Drinks	Water, herbal tea, broth, electrolyte drinks, sipped between meals	Fizzy drinks, sugary drinks, alcohol, and drinking a lot during a meal

General patterns commonly reported on GLP-1 treatment, not medical advice and not a list of prohibited foods. Individual tolerance varies. Discuss your own diet with your provider, and with a registered dietitian if you work with one.

Nothing on the right is banned. The point is timing: the day after an injection, and the week after a dose increase, is when the right column bites hardest. Full symptom management is on how to reduce GLP-1 side effects, and alcohol gets its own answer on can you drink alcohol on a GLP-1.

Practical meal shapes that fit a smaller appetite

It helps to stop thinking in terms of a plate and start thinking in terms of a shape: a protein anchor, something with fibre, something plain, kept small and eaten slowly.

Breakfast. Two eggs with a slice of toast. Greek yoghurt with berries. Overnight oats made with milk and a spoon of protein powder.
Lunch. Chicken and rice with roasted vegetables, in a smaller portion than you would have plated before. A lentil or chicken soup with bread.
Dinner. White fish with potatoes and a cooked green vegetable. Tofu or turkey stir fry, going easy on the oil.
Snacks that are not just carbohydrate. Cottage cheese, a boiled egg, edamame, a small handful of nuts, a protein shake.
Half now, half later. Serve less than you think you want and go back if you are still hungry. Reheating a small second portion is easier than pushing through a large first one.
Slow down deliberately. Fullness arrives faster and later than it used to. Eating quickly is how people find the stopping point only after they have passed it.

Hydration and fibre, the two boring ones that matter

These are not filler advice. Dehydration from nausea, vomiting, or diarrhea is the mechanism behind the acute kidney injury warning on both the semaglutide and tirzepatide labels, and it is also behind a good deal of the fatigue, headache, and constipation that people blame on the medication itself.

Sip through the day rather than drinking a lot at once, which fills a slow-emptying stomach and crowds out food you need.
Drink between meals rather than during them, for the same reason.
Use electrolytes after vomiting or diarrhea, not just plain water.
Keep fibre coming from food where you tolerate it, increasing gradually rather than all at once, since a sudden jump adds bloating on top of slowed digestion.
Move daily. Unglamorous and genuinely effective for constipation.
Ask before adding a laxative, a fibre supplement, or an antacid. Delayed gastric emptying can affect how oral products are absorbed, so your provider should know.

Dark urine, dizziness on standing, or barely urinating means act now rather than later. If you cannot keep fluids down for a day, contact your provider rather than waiting it out.

What to do on a day when nothing appeals

This day happens, usually within 48 hours of an injection or in the week after a step up. The instinct is to eat nothing at all, and that is the response that makes tomorrow worse. What you want is a floor, not a menu.

A workable bad day

Something cold and bland: yoghurt, kefir, a smoothie, a protein shake
Broth or a simple soup, which covers fluid and salt at the same time
Plain starch in small amounts: toast, crackers, rice, plain potato
Small amounts often, rather than trying to face a meal
Sipping fluids steadily through the day
Fresh air, and staying upright for a while after eating

What makes it worse

Eating nothing all day and then eating a full meal at night
Fried, greasy, or very rich food, the most reported trigger
Very sweet food or drink on an empty stomach
Alcohol, which worsens nausea and reflux
Fizzy drinks, which add bloating and burping
Lying down soon after eating, which invites reflux

One bad day is a bad day. A pattern of bad days is a dosing conversation. If you are regularly unable to eat or drink normally, or symptoms are still building after a couple of weeks at a stable dose, that is a call to your provider rather than something to endure.

Why this is easier with a provider than alone

Almost every fix above eventually meets a decision that is not yours to make alone: hold this dose, slow the pace, set this protein target, add or avoid this over-the-counter product. At Expert Health, compounded semaglutide starts at $199 per month ($597 for a 3-month supply) and compounded tirzepatide at $332 per month ($997 for a 3-month supply):

A free consultation with a health specialist, with no obligation to buy
A US-licensed provider who reviews your history, including kidney disease, diabetes, and any condition that changes your nutrition targets
Medication compounded by an FDA-regulated US pharmacy, with free discreet shipping
Provider check-ins every four weeks, where appetite, intake, and tolerability are all fair game

Compounded medications are not FDA-approved, meaning the FDA has not reviewed them for safety, effectiveness, or quality before they are dispensed. This page is general information, not medical advice, and it does not replace your provider's instructions or a dietitian's plan.

Semaglutide, as low as $199/mo Prescribed by a US-licensed provider, compounded by a licensed US pharmacy, shipped free. See the full plan and what is included.