MMP8 and obesity due to melanocortin 4 receptor deficiency: Out of the 47 common genes to male and female specific to the weight gain groups, 11 relate to obesity traits and metabolic syndrome according to previous studies: LTF[49], OLFM4[50], LCN2[51], OLR1[52], MMP8[53], PDK4[54], RNASE3[55], APOA4[56], CHIT1[57], GPER1[58] and CPT1A[59].