What Shapes Your Daily Calorie Allowance?
Your daily calorie intake is largely determined by your Total Daily Energy Expenditure (TDEE) — the number of calories your body burns across everything you do in a day, from breathing and digesting food to walking and exercising. To create a gradual calorie deficit (burning more than you eat), most guidance suggests reducing intake by roughly 500 calories below your TDEE, though this is a general educational figure rather than a personal prescription.
Key factors that influence how many calories you can intake
- Basal metabolic rate (BMR): the calories your body needs at rest, driven by your weight, height, age, and biological sex.
- Activity level: the more you move, the more calories you burn — and therefore the more you may be able to eat while still losing weight.
- How GLP-1 medicines affect appetite: many people on Mounjaro or Wegovy find their appetite reduces significantly, meaning they naturally eat less without strict counting. This is commonly reported, though the degree varies between individuals.
- Rate of weight loss goal: a more modest deficit generally supports muscle preservation and feels more sustainable.
A note on eating too little
Eating significantly below around 1,200 calories (for most adults) risks missing out on essential nutrients and can make it harder to maintain muscle mass — something worth discussing with your prescriber or doctor if you find your appetite has dropped sharply. You can explore how many calories you can have in a day for a broader look at daily targets, or read about how many calories to eat per day to see how different factors shift that figure.
Alongside intake, understanding how many calories you can burn each day helps complete the picture — since your deficit is the gap between the two. For a practical calculation tool and deeper guidance, visit the calorie calculator hub.
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Knowing your rough calorie target is one thing — consistently hitting it is another, especially when appetite fluctuates week to week on a GLP-1 medicine. GLP Trackr's AI-powered food photo scan makes logging effortless: point your camera at a meal and get an instant calorie and macronutrient breakdown, without manually searching a database.
Once you have set a daily calorie target inside the app, every meal you log — whether by photo, barcode scan, or manual search — is tallied against it in real time. You can also set a protein target alongside your calorie goal, which matters on a GLP-1 journey where reduced appetite can make it easy to under-eat protein without realising. For a fuller view of how your intake relates to your progress, the insights dashboard surfaces correlations between what you eat and how your weight moves over time.
If you want to see how many calories you can eat framed around practical eating patterns, that page pairs well with the logging tools here.
GLP Trackr is available free on the App Store and Google Play, with a 7-day free trial — set your calorie intake goal today and let the app do the tracking.
GLP Trackr provides general informational support and tracking tools, not personalised medical or dietary advice. If you are unsure what calorie intake is appropriate for your situation, speak with your prescriber or doctor — they can factor in your full health picture.
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Frequently asked questions.
There is no single answer — it depends on your body size, activity level, and how much your appetite has changed on the medicine. Many adults in a gradual weight-loss phase consume between 1,200 and 1,800 calories daily, but your prescriber or a dietitian can help you find the right range for you.
Eating significantly below around 1,200 calories daily risks nutritional gaps and muscle loss. If your appetite has dropped sharply on your GLP-1 medicine, discuss an appropriate intake target with your prescriber or doctor rather than simply eating as little as possible.
Start by estimating your Total Daily Energy Expenditure (TDEE) — the calories you burn each day based on your weight, height, age, and activity level. Subtracting roughly 500 calories from that figure is a commonly used starting point for gradual weight loss, though individual needs vary.
GLP-1 medicines commonly reduce appetite, so many people naturally eat fewer calories without deliberately restricting. The change varies between individuals. Your total calorie needs are still shaped by your body size and activity level — the medicine may just make a lower intake easier to sustain.
GLP Trackr lets you set a daily calorie target and log every meal via AI photo scan, barcode, or search. Your running total updates in real time, and the insights dashboard shows how your intake relates to your weight progress over time. A free 7-day trial is available on iOS and Android.