Light coffee consumption is protective against sarcopenia, but frequent coffee consumption is associated with obesity in Korean adults.

Few studies have examined the effects of coffee on body composition in the general population. In this cross-sectional study, we hypothesized that coffee consumption is protective against obesity and sarcopenia in Korean adults. The study included 6906 subjects aged ≥40 years who participated in the Korean National Health and Nutrition Examination Survey in 2009-2010. Body composition was measured using dual-energy x-ray absorptiometry, and obesity was determined according to the body mass index (BMI) and waist circumference (WC). Sarcopenia was defined as an appendicular skeletal muscle mass divided by height-squared that was below the lower quintile of the study population. Participants were classified into 4 groups according to the degree of coffee consumption (<1/d, 1/d, 2/d, and ≥3/d).The numbers of participants who were obese by BMI, obese by WC, and sarcopenic were 2390 (35.5%), 2033 (28.5%), and 1438 (20.0%), respectively. On multiple logistic regression analyses, the odds ratio (OR) of sarcopenia was lower in men who drink coffee once a day compared to those who rarely drink coffee (OR: 0.69, 95% confidence interval [CI]: 0.50-0.94). Women who consumed coffee ≥3 times/d had higher obesity ORs than those who rarely drink coffee according to both obesity indices (OR: 1.57, 95% CI, 1.18-2.10 for obesity by BMI; OR: 1.33, 95% CI: 1.01-1.75 for obesity by WC). Light coffee consumption was protective against sarcopenia in men, whereas frequent coffee consumption produced a higher risk for obesity, especially in women.