Lean body mass (LBM) is total body weight minus fat mass. It includes muscle, bone, organs, connective tissue, and water. LBM is used to calculate drug dosages, set protein targets, and assess body composition beyond the limitations of BMI.
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Pro Tip
LBM is used in medicine to calculate drug doses (particularly for obese patients) because many drugs distribute in lean tissue, not fat. Dosing by total weight would overdose obese patients.
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Did You Know?
Muscles are denser than fat (1.06 vs 0.9 g/cm³), which is why muscular people can weigh more but look leaner. Two people with the same BMI can have vastly different body compositions.
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