measurement
Lean Body Mass (LBM)
Your total body weight minus fat mass — includes muscle, bone, organs, and water.
Lean Body Mass (LBM) is the portion of your body that is not stored fat — muscles, organs, bone, skin, and body water. LBM is the largest driver of BMR variation between individuals. Preserving LBM during a calorie deficit is the primary reason high-protein diets and resistance training are non-negotiable during fat loss.