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Lean Muscle Mass

Meaning

Lean muscle mass refers to the weight of muscle tissue in the body, excluding fat, bone, and other non-muscular tissues. It is a critical component of body composition and a powerful metabolic organ, serving as a primary site for glucose uptake and energy expenditure. Maintaining adequate lean muscle mass is essential for metabolic health, physical function, and overall longevity, as its age-related decline, known as sarcopenia, is a significant predictor of frailty and mortality. Hormones like testosterone and growth hormone are central regulators of its maintenance and growth.