When grouped by age (20–29, 30–39, and 40–49 years), mean BMI (p < 0.001 each), WC (p < 0.001 each), HOMA-IR (p = 0.002, p = 0.005 and p = 0.02, respectively) and insulin concentrations (p = 0.002, p = 0.005 and p = 0.01, respectively) were significantly higher in patients with MetS than in control subjects. Here, INS is linked to metabolic syndrome.