Free Tool

GLP-1 Lean Mass Projection

Weight loss on a GLP-1 is not all fat. In tirzepatide’s SURMOUNT-1 DXA substudy, roughly 26% of everything lost was lean soft tissue. This applies the published ratios to your numbers, and shows what a protein and resistance-training protocol would protect. Read the evidence behind it.

Your numbers

Lean fraction applied: 26% — from the SURMOUNT-1 DXA substudy: 5.6 kg lean of 21.5 kg total.

Defaulted to the published average for your selection. Drag it to your own target.

Compound sessions only. Cardio does not count here.

Enter your numbers to see the projected fat-versus-lean split.

Scope. Mark Bryce is a Certified Personal Trainer and executive performance coach, not a physician. This tool is an educational estimate and is not medical advice. It does not prescribe, supply or recommend any medication, and it is not a substitute for a conversation with your doctor — particularly before changing your protein intake if you have kidney disease. The evidence and sources are set out here.