Guides

Foods to eat and foods to go easy on with GLP-1 medicines

Written by the lumelume team · October 2026

No food is banned on Wegovy, Mounjaro or Saxenda. But these medicines slow how quickly your stomach empties, so some foods sit better than others, especially in the first weeks and after a dose increase. Here's what tends to help, what to go easy on, and why.

Why food feels different on treatment

GLP-1 medicines slow gastric emptying: food stays in your stomach longer, so you feel full on less. That's a large part of how they work. It also means a heavy, rich meal sits there longer too, which is when nausea, reflux and bloating tend to show up. The most common side effects of these medicines are gut-related, and they're usually most noticeable when starting or increasing the dose.

So the goal isn't a special diet. It's choosing food that does more for you in a smaller amount, and that your slower stomach handles comfortably.

Foods that tend to help

• Protein at every meal. Eggs, fish, chicken, lean red meat, tofu, legumes, Greek yoghurt, cottage cheese. Eat it first, while you still have appetite for it. Any significant weight loss takes some muscle with it, and enough protein, with some resistance exercise, is what limits that.
• Vegetables, cooked or raw. Cooked vegetables are often easier on a sensitive stomach early on. They add fibre and bulk without much energy.
• Fibre, built up gradually. Whole grains, oats, fruit, vegetables and legumes help with the constipation some people get on treatment. Add them over a week or two rather than all at once, or you may feel worse before you feel better.
• Gentle, plain carbohydrates. Rice, potatoes, kūmara, oats and wholegrain toast are usually well tolerated, in smaller portions than you're used to.
• Water, sipped through the day. Eating less means you take in less fluid from food, and vomiting or diarrhoea can dehydrate you. Sip steadily rather than drinking a lot at once.

Foods to go easy on

• Fried, greasy and very rich food. Fat slows digestion further, so a heavy meal can sit for a long time. These are consistently the hardest foods to tolerate, especially around a dose change.
• Very sugary food and drinks. Lollies, pastries and fizzy drinks add a lot of energy without filling you up, and many people find very sweet food harder to stomach on treatment.
• Large meals. A plate that felt normal before can now be too much. Smaller meals, more often, are kinder to a slower stomach.
• Fizzy drinks. Carbonation can add to bloating and burping.
• Spicy or very acidic food, if you get reflux. Not a problem for everyone. If reflux is an issue, these are common triggers.
• Alcohol. It can feel stronger on treatment, especially on an emptier stomach. See can you drink alcohol on GLP-1 medicines?

How you eat matters as much as what

• Eat slowly and stop at the first sign of fullness. On treatment, "full" arrives sooner and more abruptly. Pushing past it is one of the most common triggers for nausea.
• Don't lie down straight after eating. Staying upright gives your stomach time to empty and helps with reflux.
• Keep meals lighter around a dose increase. Side effects often bump up for a few days after each step. Plan plainer meals for those days.
• Don't skip meals because you're not hungry. A quieter appetite is the medicine working, but you still need enough food, and enough protein, to function well.
• Notice what works for you. Tolerance varies person to person. If a food keeps causing trouble, leave it for a while and try it again later.

When to talk to your prescriber

Ordinary nausea or constipation is uncomfortable, not dangerous, and usually settles. Talk to your prescriber if gut symptoms aren't easing, or if you're struggling to eat enough. Seek medical care promptly if you have severe or ongoing abdominal pain, vomiting that won't settle, or you can't keep fluids down. If you have kidney disease or another condition that affects what you can eat, check with your prescriber before changing your diet.

Common questions

Is there a list of foods I must avoid?

No. Nothing is off limits. The foods above are ones people commonly find harder to tolerate, not rules. Your own experience is the best guide.

Do I need protein shakes or supplements?

Not usually. Food comes first. A shake can help close a gap on a day you can't face much food, but it's a top-up, not the foundation.

Does it matter what I eat if the medicine is doing the work?

Yes. In the trials behind these medicines, everyone also had diet and activity support. The medicine was tested alongside changes to eating, not instead of them. See how GLP-1 medicines work, and what the trials show.