Similar differences were observed in subjects without obesity (23.77 ± 9.82 in men vs. 19.50 ± 16.71 ng/mL in women, p = 0.035 for serum hepcidin; 196 (133, 235) in men vs. 64 (32, 95) ng/mL in women, p < 0.0001 for ferritin). Here, HAMP is linked to obesity due to melanocortin 4 receptor deficiency.