What Determines How Many Calories You Should Eat Each Day?
Your personal calorie requirement is shaped by several factors working together. Understanding them helps you make sense of any estimate the calculator gives you — and why your number may look different from a friend's.
Basal Metabolic Rate (BMR)
BMR is the number of calories your body uses at complete rest just to keep essential functions running — breathing, circulation, temperature regulation. It accounts for the largest share of your total daily energy use. Body weight, height, age, and biological sex all feed into BMR calculations.
Activity Level
On top of BMR, any movement — from a short walk to a full workout — adds to your daily calorie need. Calculators typically apply a multiplier based on how active you are day to day, from largely sedentary to very active.
How GLP-1 Medicines Can Change the Picture
Many people taking Mounjaro (tirzepatide) or Wegovy (semaglutide) report a significantly reduced appetite and lower overall food intake. This is commonly described as reduced "food noise" — the constant background pull towards eating. As a result, people on these medicines are often eating well below a standard calorie estimate, which makes tracking what you actually eat day to day especially valuable. It can also help ensure you are still meeting protein and key nutrient needs even when eating less. See how much you can eat on a GLP-1 and explore understanding your calorie needs in more depth for further context.
Why Population Averages Are a Starting Point, Not a Prescription
The widely cited 2,000-calorie reference figure is a population-level average used for food labelling purposes — it is not a target for any individual. Your own number may be meaningfully higher or lower depending on your body and lifestyle. For a personalised figure, use the calculator on our calorie calculator hub as a starting-point estimate, and discuss specific targets with your prescriber or doctor, who knows your full health picture. For more on what these numbers mean day-to-day, see making sense of calories.
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 Daily Calories Automatically with GLP Trackr
Knowing a calorie estimate is one thing — consistently capturing what you actually eat is where most people find the real challenge, especially when appetite fluctuates on a GLP-1 medicine.
GLP Trackr's AI food photo scan is built for exactly this. Rather than manually searching for every ingredient, you can point your camera at a meal and the app breaks down the calories, protein, and macros in seconds. This makes logging realistic even on days when appetite is low and meals are small or irregular.
Alongside photo scanning, the app lets you set a daily calorie target and tracks your intake against it throughout the day — so you can see at a glance whether you are hitting the range that supports your goals. The daily check-in also captures food noise levels alongside your intake, which can help you spot patterns in how your appetite and eating change across your injection cycle.
All of this feeds into the app's insights view, so over time you can see how your calorie intake relates to your weight and progress — useful information to bring to your next appointment with your prescriber or doctor.
GLP Trackr does not provide personalised medical or dietary prescriptions. If you are unsure what calorie intake is right for you given your health history and medication, your prescriber or doctor is the right person to advise you.
Ready to see your daily intake clearly? Download GLP Trackr on the App Store or Google Play and start a free 7-day trial — 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
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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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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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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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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.
General reference figures suggest around 2,000–2,500 calories per day for adults, but this is a population average, not a personal target. Your actual need depends on body size, age, activity level, and other individual factors. Use a calculator as a starting point and discuss specifics with your prescriber or doctor.
Commonly cited guidance suggests around 2,000 calories per day as a rough reference for adult women, though this varies significantly based on height, weight, age, and activity level. It is a general estimate — individual needs differ, and a personalised figure is best discussed with a healthcare professional.
There is no fixed calorie amount for people taking Mounjaro (tirzepatide). Many people find their appetite reduces significantly, leading to lower intake naturally. Tracking what you actually eat day to day is valuable to ensure you are still meeting protein and nutrient needs. Your prescriber or doctor can advise on targets suited to your situation.
It can do. Wegovy (semaglutide) commonly reduces appetite, meaning many people eat less without deliberate restriction. Your energy needs do not disappear, so logging actual intake and ensuring adequate protein remains important. Speak with your prescriber or doctor if you are unsure whether your current intake supports your health.
GLP Trackr lets you log meals via AI photo scan, barcode scan, or search, and set a personal daily calorie target. The app tracks your intake throughout the day and surfaces trends over time — useful data to review with your prescriber or doctor at appointments.