What Shapes a Woman's Calorie Target for Weight Loss?
A calorie deficit — eating a little less than your body burns — is the core mechanism behind weight loss. For women, daily energy needs typically sit somewhere between 1,600 and 2,400 kilocalories (kcal) at maintenance, depending on body size and activity level; a modest deficit of around 300–500 kcal per day is commonly cited as a sustainable starting point. However, these are general educational ranges, not personal prescriptions — your own figure will differ, and your prescriber or doctor is the right person to help you set a personalised target.
Why GLP-1 medicine changes the picture
Medicines like Mounjaro (tirzepatide) and Wegovy (semaglutide) act on appetite-regulating pathways, and many women find they naturally eat less without feeling deprived. This is helpful, but it also creates a practical challenge: eating too little — particularly too little protein — can make it harder to preserve muscle mass as weight comes off. Aiming for adequate protein (many dietitians suggest around 1.2–1.6 g per kilogram of body weight as a general educational range) alongside your calorie target is widely considered important on a GLP-1 journey.
Protein, fullness, and food choices
Because appetite can be significantly reduced, every meal becomes an opportunity to prioritise foods that do the most work: lean protein sources (chicken, fish, eggs, legumes, low-fat dairy), vegetables, and whole grains tend to be well tolerated and keep you fuller for longer. Highly processed foods and large portions of refined carbohydrates are generally harder to fit into a lower-calorie day without crowding out nutrients. See our guide on daily calorie needs for women for more context on how these numbers are calculated, and our page on how many calories to eat to lose weight for a broader breakdown of the deficit approach.
For a practical look at calculating the deficit itself, our calories needed to lose weight page walks through the key factors involved.
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 Calories in GLP Trackr
Knowing your target is one thing; hitting it consistently while your appetite fluctuates week to week is another. GLP Trackr's AI food-scan feature lets you point your phone camera at a meal and get an instant calorie and protein breakdown — no manual entry needed. On days when appetite is low and meals are small, this makes it easy to check you are still reaching your protein goal without obsessing over portion sizes.
Alongside food scanning, you can set a daily calorie and protein target inside the app and watch your totals build through the day. The barcode scanner and food search cover packaged foods and snacks, while the recipe library offers GLP-1-friendly meal ideas built around protein and gentle-on-the-stomach ingredients — useful when you are unsure what to cook around a reduced appetite.
Bringing a week's worth of food and calorie data to your prescriber appointment is straightforward with GLP Trackr's summary view, so any adjustments to your targets can be made with your full picture in front of you. For more on building a sustainable deficit, visit our hub on understanding your calorie deficit.
Ready to take the guesswork out of calorie tracking? Download GLP Trackr on the App Store or Google Play — 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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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.
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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.
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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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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.
There is no single figure that applies to every woman. A general educational starting point is a deficit of around 300–500 kcal below your daily maintenance needs, but your exact target depends on your body size, activity level, and how your appetite is responding. Always set a personalised target with your prescriber or doctor.
Eating too little — especially too little protein — can make it harder to preserve muscle as you lose weight. Very low calorie intake should only be followed under clinical supervision. If you are unsure whether your intake is appropriate, speak with your prescriber or doctor before making changes.
A widely referenced general range is around 1.2–1.6 g of protein per kilogram of body weight per day, though individual needs vary. Because GLP-1 medicines reduce appetite, prioritising protein at each meal helps protect muscle. Your healthcare professional can advise on a target suited to you.
Factors including height, current weight, age, activity level, and individual response to the medicine all influence how many calories a woman burns and how much her appetite is reduced. This is why calorie targets are most useful when personalised with support from a prescriber or dietitian.
GLP Trackr lets you log food by snapping a photo, scanning a barcode, or searching a food database. You can set a daily calorie and protein target and track your totals throughout the day, making it straightforward to stay consistent even when your appetite changes week to week.