Free tool · from the 2025 joint advisory
How much protein on a GLP-1?
1.2 to 1.6 g of protein per kg of body weight a day while losing weight, the range the 2025 joint advisory on GLP-1 nutrition cites, or a simpler 80 to 120 g a day. At 200 lb, that is 109 to 145 g.
You
Example numbersProtein a day
109–145g1.2–1.6 g per kg
- Your weight in kg
- 90.7 kg
- The simpler target
- 80–120 ga day, at any weight
At higher weights, per-kg targets can run high. The advisory notes that working from actual weight can overestimate the need; its flat 80–120 g a day is the simpler target.
“Higher targets, such as 1.2–1.6 g/kg/day, have also been proposed during active weight reduction”
Where the range comes from
In 2025 four societies (the American College of Lifestyle Medicine, the American Society for Nutrition, the Obesity Medicine Association and The Obesity Society) published a joint advisory on nutrition for people taking GLP-1 medicines. On protein it gives these figures:
0.8 g per kg a day is the adult recommended daily allowance. 1.2 to 1.6 g per kg a day “have also been proposed during active weight reduction”. A flat 80 to 120 g a day is the simpler target it offers. It sets a floor (not below 0.4 to 0.5 g per kg) and a ceiling (not 2 g per kg or more for long), and says 1.5 g per kg of lean mass is more exact when body composition is known.
Example: at 200 lb (91 kg) and losing weight, 1.2–1.6 g per kg is 109–145 g of protein a day; the advisory's simpler target is 80–120 g a day.
Protein works with training
A GLP-1 lowers appetite, so protein can be hard to reach; the advisory suggests eating the protein in a meal first, and lower-volume protein foods such as fish, eggs, Greek yogurt and cottage cheese. It is plain that protein isn’t enough on its own:
“increased protein intake alone is likely inadequate to support the preservation of muscle mass in the absence of structured resistance/strength training”
Questions
Should I use my current weight or my goal weight?
The advisory says it is unclear whether these targets should use actual, adjusted or ideal body weight, or fat-free mass, and that actual weight can significantly overestimate the need. Its simpler alternative is a flat 80–120 g a day.
Is more protein always better?
Not past a point: the advisory says intake at or above 2 g per kg a day for a long time should be avoided, and that more protein alone likely won’t preserve muscle without strength training.
Sources
- Mozaffarian D, et al. Nutritional priorities to support GLP-1 therapy for obesity: a joint Advisory from the American College of Lifestyle Medicine, the American Society for Nutrition, the Obesity Medicine Association, and The Obesity Society. Obesity 2025;33(8):1475–1503.The protein section: the RDA, the 1.2–1.6 g/kg range during active weight reduction, the 80–120 g/day target, the floor and the ceiling. Co-published in Am J Clin Nutr 2025;122(1):344–367. A 2026 correction changed one sentence on another study, not the protein figures.
Read on Oct 19, 2026, with its 2026 correction.
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