(a,b) Sex-specific prevalence of low lean mass with obesity, by obesity definition, 1999–2004. Rates of low lean mass obesity using the ALM definitions of sarcopenia from the Foundation for the National Institutes of Health and three definitions of obesity (body fat percent, waist circumference, and body mass index). Obesity defined using body fat cutpoints were ≥25% in men and ≥35% in females; waist circumference ≥88/102 cm in men/women and body mass index ≥30 kg/m2. Sarcopenia is defined as ALM <19.75 kg and <15.02 kg in men and women. ALM = appendicular lean mass.