Lean body mass
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Lean body mass (LBM), sometimes conflated with fat-free mass, is a component of body composition. Fat-free mass (FFM) is calculated by subtracting body fat weight from total body weight: total body weight is lean plus fat. In equations:
- LBM = BW − BF
- Lean body mass equals body weight minus body fat
- LBM + BF = BW
- Lean body mass plus body fat equals body weight
LBM differs from FFM in that cellular membranes are included in LBM although this is only a small percent difference in the body's mass (up to 3% in men and 5% in women)