Subjects will be men and women, 21 to 50 yrs of age of all races and ethnic groups. The two groups (i.e. groups with different CD36 genetic variants) will be matched as closely as possible in age, sex, body mass index and race distributions. Subject population will consist of lean subjects (BMI >18-<25 kg/m2) and subjects with obesity (BMI >29.9 kg/m2).