BMI and plasma leptin levels were 33.6 kg/m2 and 10.3 ng/mL, respectively, in obese subjects from the study by Sundell and colleagues [15], and 38 kg/m2 and 21.2 ng/mL, respectively, in subjects with MetS in the study by Schinzari and colleagues [49]. Here, LEP is linked to metabolic syndrome.