What Determines Your Daily Calorie Needs?
Your daily calorie requirement is often estimated using your Total Daily Energy Expenditure (TDEE) — the number of calories your body burns in a typical day, including everything from basic functions like breathing to physical movement. TDEE is calculated from your Basal Metabolic Rate (BMR), which is your resting energy use, adjusted upward for your activity level.
Key factors that influence your number
- Body size and composition: larger bodies and those with more muscle mass generally burn more calories at rest.
- Age: metabolic rate tends to slow gradually with age.
- Biological sex: on average, people assigned male at birth have a slightly higher BMR due to greater muscle mass — though individual variation is wide.
- Activity level: a sedentary desk-based day and an active job can differ by several hundred calories.
- Current health and medication: GLP-1 medicines like Mounjaro (tirzepatide) and Wegovy (semaglutide) can reduce appetite and food intake significantly, which is worth factoring in when thinking about nutrition goals.
General educational ranges
General guidance from public health bodies suggests roughly 2,000 calories a day as a reference point for adult women and around 2,500 for adult men — but these are population averages, not personal targets. Your own needs may be meaningfully higher or lower. For specific targets tailored to your health history and goals, talk to your prescriber or a registered dietitian.
If you want a personalised starting estimate, our calorie calculator can help you work out a figure based on your own details. You might also find it useful to explore how many calories to eat generally or see guidance on daily calorie needs for women specifically.
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Tracking Your Calories Accurately on a GLP-1 Journey
Knowing your target is one thing — hitting it consistently is another, especially when appetite fluctuates on a GLP-1 medicine. GLP Trackr's AI food photo scan makes this genuinely easy: point your camera at a meal and get an instant breakdown of calories, protein, and macros without manual searching or weighing.
Once you have a calorie goal in mind, you can set it as a daily target inside the app. GLP Trackr then tracks your intake against that target through the day — whether you log by photo, barcode scan, or manual search — so you always know where you stand. The daily check-in ties food, weight, energy, and mood together, helping you spot how your nutrition relates to how you feel and how your progress is going.
If you're on Mounjaro or Wegovy and wondering how your calorie intake should adjust as your dose changes, take a look at our guide on how many calories to eat on Mounjaro. Any specific targets — particularly if you have other health conditions — are worth discussing with your prescriber or doctor, who can give guidance based on your full picture.
GLP Trackr is available free on the App Store and Google Play. Set your calorie target, scan your first meal, and see how effortless consistent tracking can be — your first 7 days are completely free.
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Start every day with a 60-second wellness check-in. Log how you're feeling, track nausea, appetite, energy, and mood — giving you and your care team a complete picture of how your medication is working.
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Staying hydrated is especially important on GLP-1 medications. Set daily water targets, log intake throughout the day, and receive smart nudges when you're falling behind your goal.
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Frequently asked questions.
A modest calorie deficit below your Total Daily Energy Expenditure is generally how weight loss occurs, but the right deficit for you depends on your individual stats and health history. A prescriber or registered dietitian can help you set a safe, sustainable target rather than a one-size-fits-all figure.
GLP-1 medicines like Mounjaro and Wegovy often reduce appetite significantly, so many people naturally eat less. Prioritising protein and nutrient-dense foods within whatever you can comfortably eat is widely recommended. Your prescriber or doctor is best placed to advise on a specific calorie goal for your situation.
Public health guidance commonly references around 2,000 calories a day as an average for adult women, but individual needs vary widely based on height, weight, age, and activity level. Use a TDEE calculator as a personalised starting point and discuss targets with a healthcare professional.
Your daily calorie need is estimated from your Basal Metabolic Rate — a calculation using height, weight, age, and sex — multiplied by an activity factor. GLP Trackr's calorie calculator can produce a personalised estimate, and your prescriber or a dietitian can refine it for your health goals.
GLP Trackr lets you set a daily calorie target and log meals by AI photo scan, barcode, or manual search. The app totals your intake throughout the day and shows how it stacks up against your goal, making consistent tracking straightforward even when appetite varies on a GLP-1 medicine.