How Macros Work — and Why They Matter on a GLP-1 Medicine
Macronutrients are the three main sources of energy in food: protein, carbohydrates and fat. Each plays a different role, and on a GLP-1 journey the balance shifts in importance.
Why protein tops the list
Many people eating less on Mounjaro or Wegovy find their total calorie intake drops significantly. When calories fall, the body can draw on muscle as well as fat for energy. Prioritising protein — many general nutrition guidelines suggest somewhere in the range of 1.2–1.6 g per kg of body weight, though individual needs vary — helps protect lean mass. Your prescriber or doctor can advise on a target that suits your specific situation.
Carbohydrates and fat
Neither carbohydrates nor fat need to be eliminated. A practical starting point that many nutrition professionals use is to meet your protein goal first, then fill remaining calories with a balance of carbohydrates and fat that you find sustainable and that sits comfortably with any GI side effects you may be experiencing. Foods that are lower in fat and easier to digest are often better tolerated when nausea or fullness is an issue.
How the calculator works
Enter your weight, height, age, sex and activity level. The calculator estimates your total daily energy expenditure and then applies a macro split — you can adjust the protein percentage to match your goals. The result is a general educational guide, not a personalised medical prescription; treat it as a conversation-starter with your healthcare professional rather than a fixed rule.
For a broader picture of your energy needs, our calorie calculator for GLP-1 users sits alongside this tool and helps you understand total intake. You can also explore macro tracking in more depth or use the macro counter to log individual meals against your targets.
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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Track Your Macros Automatically in GLP Trackr
Calculating your macros is one step — hitting them consistently every day is another. GLP Trackr is built specifically for people on Mounjaro and Wegovy, and its food-logging tools make daily macro tracking almost effortless.
AI photo scan does the heavy lifting
Point your phone camera at a meal and the AI food scan instantly estimates calories, protein, carbohydrates and fat — no manual searching required. On days when appetite is low and meals are small, the last thing you want is to spend time typing ingredients. The photo scan takes seconds and feeds straight into your daily totals.
Set protein and calorie targets that match your numbers
Once you have your macro targets from the calculator above, you can set them directly inside GLP Trackr. The app tracks your running totals through the day and shows you at a glance how close you are to your protein and calorie goals — so you can make a small adjustment at your next meal rather than realising at bedtime that protein was short again.
See patterns over time
The insights feature connects your nutrition data to your weight and wellbeing logs, so you can start to see whether days with higher protein correlate with better energy or steadier progress. You can also check a weight reduction estimate alongside your macro data to keep the full picture in one place.
GLP Trackr is available on the App Store and Google Play — give it a go with a free 7-day trial and see how much easier consistent macro tracking becomes when the app does the counting for you.
The macro targets produced by this calculator are general educational estimates. They are not a substitute for personalised advice from your prescriber or doctor, who can factor in your full health history and any medicines you are taking.
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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.
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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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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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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.
A macro calculator estimates how many grams of protein, carbohydrates and fat to aim for each day based on your weight, height, age, activity level and goals. It gives a general educational starting point — your prescriber or doctor can tailor targets to your individual needs.
Many general nutrition guidelines suggest roughly 1.2–1.6 g of protein per kg of body weight when trying to preserve muscle during weight loss, though this varies by individual. Because appetite is often reduced on GLP-1 medicines, prioritising protein at each meal is commonly recommended. Always confirm your personal target with your healthcare professional.
Yes — the macro calculator on this page is completely free to use. You enter your details and receive an estimated macro breakdown at no cost. GLP Trackr also offers a free 7-day trial so you can track those targets daily in the app.
Set your macro targets inside the app, then log meals using the AI photo scan, barcode scanner, or food search. GLP Trackr totals your protein, carbohydrates and fat throughout the day and shows your progress against each target in real time.
Macro calculators provide useful general estimates, not precise clinical prescriptions. They are a helpful starting point for building consistent eating habits alongside your treatment. For personalised guidance — especially if you have other health conditions — speak with your prescriber or a registered dietitian.