Meanwhile, the expressions of some zinc transporters, such as ZNT1 and ZNT6 in brain [53], ZIP14 in adipose [54, 55], and ZnT4, ZnT5, ZnT9, ZIP1, ZIP4 and ZIP6 in leukocyte [56], were inversely correlated with obesity. Here, SLC30A4 is linked to obesity due to melanocortin 4 receptor deficiency.