Tracking Calories on Mounjaro or Wegovy: What to Know and How an App Helps

GLP-1 and dual GIP/GLP-1 medicines like Wegovy (semaglutide) and Mounjaro (tirzepatide) commonly reduce appetite and the experience of "food noise" — the persistent urge to eat. For many people this means eating significantly less without consciously trying to. That can be positive for a calorie deficit, but it also creates a risk: eating so little that protein, fibre, and key nutrients fall short of what the body needs, particularly to preserve muscle mass during weight loss.

What tracking actually tells you

When you log meals consistently, patterns become visible that are hard to spot otherwise:

• Whether protein intake is holding up — many people on GLP-1 medicines benefit from prioritising protein, especially when overall food volume is lower. General guidance often suggests aiming for around 1.2–1.6 g per kg of body weight, though your own prescriber or a registered dietitian is the right person to give you a personal target.
• Where calories are actually coming from — low appetite can sometimes mean reaching for easy, calorie-dense snacks rather than balanced meals.
• How appetite changes across the week — many people find appetite and nausea fluctuate around injection day, and a food log shows those rhythms clearly.

General vs personalised targets

General educational calorie ranges (for example, that most adults maintain weight on roughly 1,600–2,500 kcal depending on size and activity) are useful context, but the right target for you depends on your body, your activity level, and your clinical situation. Treat any number you read online — including here — as a starting reference, not a prescription. Your prescriber or doctor is the person to confirm what is appropriate for you.

If you are looking at the broader question of understanding a calorie deficit on a GLP-1 journey, that guide covers the underlying principles in more depth. For comparisons of the best apps for tracking calories when you are on Mounjaro or Wegovy, or for thoughts on what makes a good calorie tracking app for GLP-1 users, those pages go deeper on the options available.

The feature that makes the biggest practical difference for most GLP-1 users is AI photo food scanning — point your camera at a plate, and GLP Trackr estimates the calories, protein, and macros almost instantly. When appetite is low and meals are smaller, the last thing most people want is to manually weigh and enter every ingredient. A quick photo keeps the habit alive even on low-appetite days.

Beyond the photo scan, the app also supports barcode scanning and manual search, so whatever form your meal takes — packaged food, home-cooked, or a restaurant meal — there is a fast way to log it. Once your food is in, the app tracks your running calorie and protein totals against the targets you have set, so you can see at a glance whether you are on track or running low by mid-afternoon.

Alongside food logging, GLP Trackr's calorie tracking features connect to your weight log, daily check-in, and weekly insights, so you can start to see how your eating patterns relate to how you feel and how your weight moves over time. That kind of joined-up picture is genuinely hard to build from a food diary alone.

GLP Trackr also includes a library of GLP-1-friendly meal ideas and recipes built around protein and foods that tend to sit well when appetite is reduced — useful when you want quick inspiration that fits where you are in your journey.

A note on targets: GLP Trackr helps you set and monitor calorie and protein goals, but the right numbers for your situation are something to confirm with your prescriber, doctor, or a registered dietitian — the app supports your tracking, it does not replace that conversation.

Ready to make calorie tracking a consistent part of your GLP-1 routine? GLP Trackr is free to try on the App Store and Google Play — your first seven days are on us, no commitment needed.