How Much Should I Eat Each Day on a GLP-1 Medicine?

There is no single calorie figure that works for everyone. Several factors shape how much food your body actually needs each day, and understanding them helps you make more informed choices to discuss with your healthcare professional.

Your total daily energy needs

Your body burns a baseline number of calories just to keep you going — often called your total daily energy expenditure (TDEE). This is influenced by your current weight, height, age, and how active you are. Creating a modest calorie deficit (eating a little less than you burn) is generally what supports gradual weight loss, but going too low can leave you fatigued, lead to muscle loss, and make the journey harder to sustain. For a deeper look at how a calorie deficit works, see our guide to understanding your calorie deficit.

Protein comes first on GLP-1 medicines

Because these medicines reduce appetite significantly, there is a real risk of not eating enough — and particularly of not eating enough protein. Protein helps preserve muscle mass during weight loss and keeps you feeling fuller for longer. Many people on Mounjaro or Wegovy find that aiming for protein at every meal, even small portions, is the most useful shift they can make. For practical guidance on daily amounts and food sources, see how much to eat on Mounjaro.

Quality over quantity

Reduced appetite means fewer opportunities to get nutrients in. Prioritising nutrient-dense foods — lean protein, vegetables, wholegrains, healthy fats — gives your body more to work with even when portions are smaller than they used to be. Ultra-processed foods and high-sugar options tend to offer less satiety per calorie, which matters more when overall intake is lower.

How much walking also plays a role

Physical activity — even gentle daily walking — increases the number of calories your body uses and supports overall wellbeing. Many people find that building regular movement into their routine helps with energy, mood, and progress. While there is no one-size-fits-all step target, staying consistently active complements the appetite changes the medicine brings. You can explore how calorie needs shift when you are trying to lose weight for more context.

When appetite is low and meals are smaller, it can be surprisingly hard to know whether you are hitting a reasonable calorie and protein intake each day. GLP Trackr's AI photo-scan food logging makes it effortless: point your camera at your plate and the app estimates the nutrition breakdown instantly — no weighing, no manual searching required. You can also scan barcodes or search foods manually if you prefer.

From there, you can set daily targets for calories, protein, and other nutrients, and the app tracks your progress against them throughout the day. Over time, the insights feature shows you patterns — for example, whether lower-protein days coincide with dips in energy — that are genuinely useful to bring to your next prescriber appointment.

For a broader look at daily calorie targets and how to set them, the guide to how many calories to eat each day is a helpful companion to this page.

GLP Trackr is a tracking tool, not a substitute for personalised clinical guidance. Always follow the advice of your prescriber or doctor about your specific dietary and calorie needs — they know your full health history and can tailor recommendations in a way a general guide cannot.

Ready to take the guesswork out of eating on a GLP-1 medicine? GLP Trackr is free to try for 7 days — available on the App Store and Google Play. Snap a photo of your next meal and see how the nutrition adds up.