Since FGF21 show a strong association with obesity, we categorized the study participants into non-obese (BMI < 25 kg/m2) and obese (BMI ≥ 25 kg/m2) groups and assessed the association between FGF21 levels and each parameter in both groups (Supplementary Table S1 online and Table 4). This evidence concerns the gene FGF21 and Obesity.