Calories, Maintenance, and the Deficit Explained
A calorie (more precisely, a kilocalorie or kcal) is a unit of energy — it measures the energy your body gets from food and drink, and the energy it burns keeping you alive and moving. If you want to go deeper on the unit itself, understanding kilocalories is a helpful next step.
What is calorie maintenance?
Your calorie maintenance level (sometimes called Total Daily Energy Expenditure, or TDEE) is the number of calories that keeps your weight stable — neither gaining nor losing. It varies from person to person based on age, weight, height, activity level, and individual metabolism. Eating below this level creates a deficit; eating above it creates a surplus.
How big should a deficit be?
A modest, sustainable deficit — often broadly cited in nutritional guidance as somewhere in the region of 300–500 kcal per day below maintenance — is generally considered more manageable than aggressive restriction, though the right amount for any individual depends on their health, activity, and what their prescriber or doctor advises. No specific target here should be taken as a personal recommendation.
Why this matters on GLP-1 medication
Medicines like Mounjaro (tirzepatide) and Wegovy (semaglutide) act on appetite-regulating pathways, and many people find they feel fuller sooner and experience reduced food cravings — effects commonly described as quieter food noise. This can naturally shift eating patterns, but it does not replace the value of tracking what you eat. Without logging, it is easy to under-eat protein, miss your targets, or not notice a plateau forming. Understanding your calorie deficit diet gives that appetite shift a clear framework to work within.
For a broader guide to energy balance and how to calculate your own numbers, the calorie deficit hub covers the topic in full, including practical tools and strategies.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
Tracking the right four numbers — weight, waist, protein and dose — turns a noisy chart into a clear story. That's the loop GLP-1 users keep coming back for.
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Tracking Your Calorie Deficit with GLP Trackr
Knowing what a calorie deficit is and actually hitting one day after day are two different things — especially when appetite on GLP-1 medication fluctuates. That is where logging makes the difference.
GLP Trackr's AI food photo scan is the fastest way to track: point your camera at a meal and the app estimates calories, protein, and macros instantly. There is no need to search databases or weigh every portion — useful on the days when appetite is low and meals are improvised. You can also use barcode scanning or manual search when you prefer.
Once your food is logged, the app tracks your progress against your daily calorie and protein targets, so you can see at a glance whether you are in a deficit, and by how much. The calorie calculator can help you work out a sensible starting target to enter.
GLP Trackr also connects food data with your weight trend and daily check-ins — mood, energy, and sleep — so you can start to see what patterns are actually moving your results, not just what the scales say on a given morning.
Always follow your prescriber or doctor's guidance on nutrition targets; GLP Trackr helps you record and understand your intake, but is not a substitute for personalised clinical advice.
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Snap a photo of any meal and get a full nutrition breakdown in seconds — calories, protein, carbs, fat, and fibre. No searching. No manual logging. Just point, snap, and track.
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Frequently asked questions.
A calorie deficit occurs when you consume fewer calories than your body uses in a day. Your body then draws on stored energy — mainly body fat — to meet its needs. A consistent, moderate deficit is the basis of most weight-management approaches.
Calorie maintenance is the number of calories that keeps your weight stable — neither gaining nor losing. It is also called Total Daily Energy Expenditure (TDEE) and varies by age, height, weight, and activity level. Eating below this level puts you in a deficit.
In nutrition, a calorie (kcal or kilocalorie) is a unit of energy. It measures the energy food provides and the energy your body burns. All food and drink contributes calories; the balance between intake and expenditure determines whether your weight rises, falls, or stays the same.
Mounjaro and Wegovy act on appetite pathways, which many people find makes eating less feel more manageable. A calorie deficit still needs to be present for weight change to occur. Tracking intake helps confirm you are in a deficit and that you are eating enough protein. Always discuss nutrition targets with your prescriber or doctor.
GLP Trackr lets you log meals via AI photo scan, barcode, or search, then tracks calories and protein against your daily targets. The app shows your running deficit and connects food data with your weight trend, helping you spot patterns over time.