Serum leptin levels in children with MetS in the present study (32.42 ± 21.39 ng/mL) were twofold higher than those indicated in the results reported in Chinese children aged 6–18 years with three or more components of MetS (15.03 ng/mL in boys and 16.35 ng/mL in girls) [32]. This evidence concerns the gene LEP and metabolic syndrome.