Multiple linear regression models adjusting for age demonstrated that the obesity group had significantly higher fasting insulin levels (β = 5.59, 95% CI: 0.43–10.76, p = 0.034) and TG/HDL-C ratio (β = 0.25, 95% CI: 0.02–0.47, p = 0.032) compared to the lean group. Here, INS is linked to obesity due to melanocortin 4 receptor deficiency.