How your calorie target is calculated
Your calorie needs are shaped by two things working together: how much energy your body uses just to stay alive (your basal metabolic rate, or BMR), and how much additional energy you burn through daily movement (your total daily energy expenditure, or TDEE). Multiply your BMR by an activity factor — typically 1.2 for largely sedentary days up to around 1.9 for very active ones — and you have a rough TDEE figure to work from.
Why GLP-1 medicines change the equation
Medicines like tirzepatide and semaglutide commonly reduce appetite and the experience often described as "food noise." Many people on these medicines find they feel full on smaller portions, which naturally reduces intake. Because of this, the calorie window that feels manageable may be lower than a standard calculator suggests — and getting enough protein and micronutrients within that smaller intake becomes more important, not less.
A general educational range
General nutrition guidance (not a personal prescription) often points to a moderate deficit of around 500 kcal below TDEE as a starting framework for gradual, sustainable progress. However, eating below roughly 1,200–1,400 kcal consistently is not advisable without clinical supervision, because it becomes harder to meet protein and micronutrient needs. Always discuss your specific target with your prescriber or doctor — they know your full picture.
For a deeper look at energy balance, the guide on how many calories are in a pound of body weight gives useful context on what a calorie deficit actually means in practice. You can also explore the step-by-step approach in how to figure out how many calories to eat, or the related walkthrough at figuring out your calorie needs in plain steps.
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 calories automatically with GLP Trackr
Once you have a target, the hardest part is logging meals consistently — especially on days when appetite is low and eating feels like an afterthought. GLP Trackr's AI food photo scan is the feature that removes most of that friction: point your camera at a meal and the app estimates calories, protein, and macros instantly, without manual searching or weighing.
Beyond that, the app lets you set a daily calorie target and a protein goal so you can see at a glance whether you're on track. The daily check-in also captures your energy levels alongside your food data, which means over time you can spot patterns — like whether hitting your protein target on a given day correlates with feeling more energised the next morning.
For a full overview of calorie tools and how they fit a GLP-1 journey, visit the calorie calculator hub.
GLP Trackr is free to try for 7 days — download it on the App Store or Google Play and let the app do the calorie arithmetic for you.
What does glptrackr include?
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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.
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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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The first AI built exclusively for GLP-1 weight loss. Every insight, every meal plan, every prediction trained on one thing only: helping you get the most out of your medication.
Knows Your Cycle
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.
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Frequently asked questions.
Estimate your total daily energy expenditure (TDEE) by multiplying your basal metabolic rate by an activity factor, then apply a moderate deficit. General guidance suggests around 500 kcal below TDEE, but your specific target should be agreed with your prescriber or doctor.
These medicines commonly reduce appetite, so many people naturally eat less. Staying mindful of protein and micronutrient intake within a smaller eating window becomes especially important. Discuss any significant changes to your intake with your prescriber or doctor.
General nutrition guidance cautions against consistently eating below roughly 1,200–1,400 kcal without clinical supervision, as it becomes difficult to meet protein and nutrient needs. Your prescriber or doctor can advise on a safe floor for your individual situation.
GLP Trackr lets you log meals by snapping a photo — the AI estimates calories and macros automatically. You can set a daily calorie and protein target, and the app shows your progress throughout the day so you can stay on track without manual calculations.
BMR (basal metabolic rate) is the energy your body needs at complete rest to maintain basic functions. TDEE (total daily energy expenditure) adds the calories burned through daily activity on top of BMR, giving a more realistic picture of your full daily energy needs.