GLP-1 Nutrition Calculator
Ozempic, Wegovy, Mounjaro, and Zepbound suppress appetite dramatically — but eating less without a plan means losing muscle, not fat. Get your adjusted protein, calorie, fibre, and water targets specifically calibrated for GLP-1 medication users.
⚠️ The Muscle Loss Problem
Research shows 25–40% of weight lost on GLP-1 medications is lean muscle mass — not fat — when users don't prioritise protein and resistance training.
💊 Works With
Related Tools
Protein Intake Calculator
Calculate your optimal daily protein intake based on body weight, goal, and activity level.
Calorie Deficit Calculator
Calculate your daily calorie deficit to lose weight at a safe, sustainable rate without sacrificing muscle.
Macro Calculator
Calculate your optimal protein, carbohydrate, and fat targets based on your calorie goal and fitness objective.
Water Intake Calculator
Calculate your optimal daily water intake based on body weight, climate, and activity level.
The GLP-1 Nutrition Problem No One Talks About
GLP-1 medications are remarkably effective for weight loss — but the rapid reduction in appetite creates a dangerous nutritional gap that most users don't recognise until the damage is done. When you're not hungry, you eat whatever is easiest — usually processed carbohydrates, soft foods, or simply too little of anything.
The result: research consistently shows that 25–40% of weight lost on GLP-1 medications is lean muscle mass, not body fat. This muscle loss crashes your basal metabolic rate, making weight regain almost inevitable once medication stops — and the regain comes back primarily as fat, not muscle.
The solution is straightforward: intentional, protein-first eating (1.8–2.4g/kg/day) combined with resistance training. Both are non-negotiable if you want the weight you lose to be fat, not muscle.
GLP-1 Phase Nutrition Guide
Weeks 1–4
Adjustment Phase
- → Nausea is most common here — eat cold, bland protein sources
- → Hydrate aggressively — GLP-1 disrupts thirst signals
- → Small meals every 3–4 hours rather than large ones
- → Take a comprehensive multivitamin daily from day 1
Weeks 4–12
Active Loss Phase
- → Track protein intake daily — appetite suppression masks deficiency
- → Eat protein first at every meal before anything else
- → Start or maintain resistance training 2–3x/week minimum
- → Weigh weekly, not daily — GLP-1 causes water weight fluctuations
Week 12+
Optimisation Phase
- → Focus shifts to body composition, not just scale weight
- → Increase training intensity to build muscle while losing fat
- → Monitor blood markers (B12, iron, D, magnesium) every 3–6 months
- → Plan your off-ramp strategy with your prescriber