PON1 and obesity due to melanocortin 4 receptor deficiency: We did not obtain any prevalence of the presence of risk factors such as arterial hypertension (p = 0.955), diabetes mellitus (p = 0.847), overweight/obesity (p = 0.723), smoking (current/ex-smokers, p = 0.914), familial predisposition (p = 0.141) between patients with different PON1 L55M genotypes.