The median values of I-FABP for each of the four groups were as follows: the MASLD group (274 pg/mL, IQR 88–1588 pg/mL), the obesity group (321 pg/mL, IQR 58–1394 pg/mL), the control group (330 pg/mL, IQR 10–1258 pg/mL), and the mixed group, where patients with MASLD and obesity were combined (420 pg/mL, IQR 58–1588 pg/mL). The gene discussed is FABP2; the disease is obesity due to melanocortin 4 receptor deficiency.