ITLN1 and obesity due to melanocortin 4 receptor deficiency: Visceral adipocyte geometries showed positive correlations with IR parameters (glucose and HOMA-IR) only in individuals without obesity, but exhibited negative correlations with QUICKI, serum adiponectin, adiponectin/leptin ratio, omentin, and/or visfatin in both groups, with generally stronger correlations observed in individuals without obesity.