How to Figure Out How Many Calories to Eat on a GLP-1 Medicine

Your daily calorie needs are shaped by three things: your basal metabolic rate (BMR — the energy your body burns at rest), your activity level, and whether you want to lose, maintain, or build weight. Multiply your BMR by an activity factor and you get your total daily energy expenditure (TDEE) — a useful starting point for any calorie target.

What goes into the calculation

• Body weight and height — heavier and taller bodies generally burn more calories at rest.
• Age — metabolic rate tends to decrease gradually with age.
• Sex — biological differences affect the calculation.
• Activity level — from mostly sedentary to very active, this multiplier makes the biggest practical difference day to day.

General educational ranges

Many adults have a TDEE somewhere between roughly 1,600 and 3,000 calories per day depending on size and activity — but individual variation is wide. A modest calorie deficit (often cited as around 300–500 calories below TDEE) is a common educational starting point for gradual weight loss, though the right approach for you is something to agree with your prescriber or doctor. General guidance like this is educational; it is not a personalised target.

Why this matters on a GLP-1 journey

GLP-1 medicines commonly reduce appetite and the sense of food noise, which means some people eat significantly less without trying. This is useful for weight management, but it also makes hitting protein and micronutrient needs harder. Knowing your calorie ballpark helps you stay intentional rather than just eating very little and hoping for the best. For more detail on the relationship between calories and weight loss, see how calories relate to a pound of weight change — the numbers there put daily targets in a useful long-term context.

You can also explore related approaches in our guides on how to figure out your personal calorie needs and tools to calculate how many calories to eat.

Knowing your target is one thing; hitting it consistently while appetite fluctuates is another. GLP Trackr's AI food photo scan is the fastest way to close that gap — point your camera at a meal and the app estimates calories, protein, and macros without manual searching or weighing. On days when eating feels like a chore, that low-friction logging makes the difference between having data and having nothing.

Once you have a calorie target in mind (ideally agreed with your prescriber), you can set it as a daily goal inside the app. Your food log feeds into it in real time, so you can see at a glance whether you are on track, falling short, or — which happens more often than people expect on a GLP-1 medicine — not eating enough to support your protein and energy needs.

The app also tracks protein alongside calories, which matters because adequate protein helps preserve muscle when you are in a calorie deficit. For a fuller picture of calorie targets and the tools available, visit the GLP Trackr calorie calculator hub.

A note on targets: general calorie ranges are educational starting points. Any personalised target — especially if you have diabetes, cardiovascular conditions, or other health considerations — should be agreed with your prescriber or doctor. GLP Trackr helps you record and observe your intake; it does not replace clinical guidance on what is right for your situation.

Ready to see your intake come together in one place? Download GLP Trackr on the App Store or Google Play — your first 7 days are completely free.