What Determines How Many Calories You Have?
Your daily calorie allowance — sometimes called your calorie budget — is shaped by several factors working together. Understanding them helps you make sense of the number rather than treating it as an arbitrary target.
Basal Metabolic Rate (BMR)
BMR is the number of calories your body needs at complete rest just to keep vital functions running: breathing, circulation, cell repair, and temperature regulation. It is influenced by your weight, height, age, and body composition. It typically accounts for the largest share of your total daily calorie needs.
Activity Level
Your BMR is multiplied by an activity factor to estimate your Total Daily Energy Expenditure (TDEE) — the realistic number of calories your body uses across a full day including movement, exercise, and daily tasks. Someone with a sedentary desk job will have a lower TDEE than someone who is on their feet all day, even if their BMR is identical.
How GLP-1 Medicines Affect Appetite and Intake
Medicines like tirzepatide (Mounjaro) and semaglutide (Wegovy) act on appetite-regulating pathways, and many people report a significantly reduced desire to eat. This can make it easy to consume far fewer calories than your body actually needs — particularly protein — which is worth being aware of as you track your intake. General educational guidance commonly suggests a modest calorie reduction from your TDEE rather than a steep cut, but any personalised calorie target should come from your prescriber or a registered dietitian, not a general formula alone.
If you want to understand what you are actually eating day to day, tracking your intake is the practical starting point. You can explore how to track what you consume and get a clearer picture of how many calories you eat in a day to compare against your estimated needs.
For a broader look at daily energy needs, see our guide on how many calories you need a day.
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.
AI Meal Tracking. Built for GLP 1 Appetites.
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Track Your Calorie Budget Automatically with GLP Trackr
Knowing your estimated calorie budget is only useful if you can also see what you are actually consuming — and that is where GLP Trackr's food logging makes things straightforward. Instead of manually calculating every meal, you can point your camera at your plate and the AI photo scan gives you an instant calorie and protein breakdown. A barcode scanner and manual search are there when photo scan is not the right fit.
Once your daily calorie and protein targets are set inside the app, your food log feeds directly into them so you can see at a glance how much of your budget you have used and what is left. On a GLP-1 medicine, where appetite signals can be suppressed, having that visual reminder of where you stand with protein and calories is genuinely useful — it is easy to under-eat without realising it.
The app's daily check-in also captures weight, energy, and how your food noise feels that day, building a picture of how your intake connects to your progress over time. You can dig into all of this through the calorie calculator hub, which brings together the tools and guidance to help you understand your numbers.
GLP Trackr is a tracking companion — it is not a substitute for personalised advice from your prescriber or a registered dietitian, who can set targets that account for your full medical history and health goals.
Ready to see your calorie budget in context with everything else on your journey? Download GLP Trackr on the App Store or Google Play and explore it free for 7 days — no commitment needed.
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Morning Check-In
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.
Injection Tracking
Log every dose with a single tap. Track your dose history, phase in your cycle, estimated medication levels, and upcoming injection dates — with reminders so you never miss a scheduled shot.
Hydration Reminders
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.
Smart Meal Planning
Personalized meal plans built around your current dose phase and side effects. Every meal is GLP-1 optimized — high in protein, gentle on the stomach, and scaled to your reduced appetite.
Recipe Library
Browse 50+ high-protein, GLP-1-friendly recipes filtered by meal type, prep time, and dietary needs. Every recipe includes full nutrition info, step-by-step instructions, and tips for eating with side effects.
Progress Analytics
Beautiful, easy-to-read charts show your weight loss trajectory, weekly nutrition trends, medication responses, and wellbeing scores over time — turning raw data into genuine insights.
AI Meal Scanning
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.
Exercise & Steps
Log walks, workouts, and movement with activity targets that flex with your energy levels. On lower-energy dose days, gentler targets keep you moving without burning out.
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Connect with thousands of others navigating the same medication journey. Share milestones, ask questions, find accountability partners, and get support from people who truly understand.
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Log your Mounjaro or Wegovy injection in seconds. Track your pen, your dose level, and your injection site — so you always know exactly where you are in your treatment.
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GLPIQ tracks where you are in your injection cycle and adjusts everything around it: lighter meals on nausea days, higher protein when appetite returns, and smarter targets as your medication level shifts.
Predicts Before You Feel It
GLPIQ learns your personal side effect patterns over time. After a few cycles, it starts warning you the morning before a rough day — and adjusts your meal plan automatically.
Finds Your Golden Dose
GLPIQ analyses every dose you've been on: weight loss rate, side effects, food noise, mood, protein adherence and tells you which dose gave you the best results. No other app does this.
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Frequently asked questions.
Your daily calorie budget is based on your Total Daily Energy Expenditure (TDEE) — a combination of your Basal Metabolic Rate (BMR) and your activity level. A TDEE calculator can give a general estimate, but a personalised target should come from your prescriber or a registered dietitian.
These medicines commonly reduce appetite, meaning many people eat less than their body needs without realising it. Your calorie needs do not disappear — eating enough protein and overall energy remains important. Speak with your prescriber or a dietitian about a target that suits your individual situation.
There is no single answer — needs vary widely by weight, height, age, and activity. General guidance often suggests a modest reduction from your TDEE rather than a steep cut. Any specific target should be agreed with your healthcare professional rather than based on a general figure alone.
GLP Trackr lets you set a daily calorie target and log meals via AI photo scan, barcode, or search. Your food log updates your remaining budget in real time, so you can see at a glance whether you are hitting your goals — useful when appetite is low and under-eating is easy to miss.
It is not mandatory, but many people find it helpful. Reduced appetite can make it easy to miss protein or energy targets without noticing. Tracking gives you visibility over what you are actually eating so you can have informed conversations about your progress with your prescriber or dietitian.