What to Eat Before and After Your GLP-1 Injection

The medication doesn't peak in the hours after your injection. Levels peak about a day after a tirzepatide injection (Mounjaro, Zepbound) and one to three days after a semaglutide injection (Ozempic, Wegovy). If your appetite dips or you feel queasy around your dose, those first few days are the ones to plan for, and planning ahead makes a real difference.

Before your injection

There's no need to time a meal around your injection. The Wegovy and Zepbound labels, like those for Ozempic and Mounjaro, say you can inject at any time of day, with or without meals. Eat as you normally would: lean protein (Greek yogurt, eggs, chicken, cottage cheese), some vegetables, and not too much fat.

The one thing to avoid, before your injection or any time, is a large, heavy or very rich meal. The 2025 joint advisory on nutrition with these medicines notes that they slow how quickly your stomach empties, leading to bloating, fullness and nausea, and that avoiding large or high-fat meals can help.

The days after

GLP-1 medications act on the brain to increase fullness, so for the days after your dose, the practical playbook is:

• Eat your protein first. Your appetite will drop, so get the most important macronutrient in early.
• Smaller is better. A large meal on injection day is a fast route to feeling unwell.
• Drink plenty of water through the day; sip rather than gulp.
• Ginger tea or plain crackers can help if nausea sets in.
• Bland foods are easier: rice, plain yogurt, banana, toast.

When eating feels impossible

On very bad days, liquids count. Bone broth, milk, kefir, a Greek yogurt drink, or a simple protein shake can get protein in without requiring much digestion or triggering nausea. Aim for at least something rather than nothing.

One low-intake day will not cause significant muscle loss. What matters is adequate protein across the week. Don't let one hard day spiral into giving up on nutrition altogether.

Planning your week

Because levels peak in the one to three days after your dose, have easy food ready for those days: batch-cook a soup or egg cups beforehand, and keep yogurt and a shake in the fridge. If you'd like your injection day to fall somewhere more convenient in your week, talk to your prescriber before changing it.

General information only, not medical advice. Never adjust your dose or timing without speaking to your prescriber first.