How to Track Calories When You're on Mounjaro or Wegovy

When appetite is significantly reduced, it's easy to eat too little — especially protein — without realising it. Many people on Mounjaro or Wegovy find their natural hunger cues change week to week as the dose is adjusted by their prescriber. Keeping a food log gives you a factual picture of intake rather than a rough guess.

What to focus on when logging

• Protein first: Most nutrition guidance for GLP-1 users emphasises adequate protein to help preserve muscle alongside any weight change. General educational ranges often cited are 1.2–1.6 g per kg of body weight per day, though the right target for you is worth discussing with your prescriber or a registered dietitian.
• Total calories: Understanding your rough daily intake helps you stay within a calorie deficit that supports steady progress without going so low that energy and nutrition suffer.
• Fibre and hydration: Both are commonly relevant on GLP-1 medicines, where digestive side effects are frequently reported. Logging water and fibre alongside calories builds a fuller picture.

Tracking without an app

It is possible to track calories without an app — many people use a notebook, a spreadsheet, or even a simple notes file on their phone. The practical challenge is that manual methods require you to look up nutritional values yourself, which adds friction on days when appetite (and motivation) is low. For people who want a lower-tech approach, keeping a rough written log of meals and portion sizes is still more useful than no record at all. That said, an app purpose-built to track calories removes most of that friction.

What makes a calorie-tracking app useful on GLP-1 medication

The most practical apps for this journey combine quick food entry (so logging a small snack takes seconds), a large food database, and the ability to set and monitor a free calorie and macro tracking approach that fits reduced-appetite eating. AI photo scanning — pointing your camera at a meal to get an instant breakdown — is increasingly available and particularly useful when you're eating smaller, less structured portions. See also: tracking calories burned to understand the full energy picture.

GLP Trackr's AI food photo scan is the fastest way to log a meal — point your camera at your plate and the app returns an instant calorie, protein, and macro breakdown without manual entry. On days when appetite is low and meals are small or irregular, that speed matters.

Beyond the photo scan, the app includes a barcode scanner and a searchable food database for packaged foods, plus a meal plan and recipe library built around GLP-1-friendly eating — higher-protein options, gentler-on-the-stomach choices, and easy ingredient swaps for when certain foods don't appeal.

You can set personal targets for calories, protein, water, fibre, and steps, and the daily check-in brings everything together in one place — food, weight, mood, energy, and sleep — so you can see how what you're eating connects to how you're feeling and progressing. The insights feature surfaces those correlations over time, turning your logged data into something genuinely useful to review or bring to a prescriber appointment.

GLP Trackr is a tracking and journaling tool, not a source of medical or dietary advice. For personalised nutrition targets — especially if you have other health conditions — always follow the guidance of your prescriber, doctor, or a registered dietitian.

Ready to take the guesswork out of eating on GLP-1 medication? Download GLP Trackr on the App Store or Google Play and try it free for 7 days — snap your first meal and see your nutrition breakdown in seconds.