Considering that the SLC30A2/ZnT2 transporter is responsible for zinc secretion in human milk, we hypothesized that this correlation may be induced by a possible selection mechanism for offspring survival in regions with elevated prevalence of zinc deficiency, with the rs3008217-C allele leading to an increased zinc secretion in human milk, and thus to greater zinc amounts available for the breastfed child [10]. The gene discussed is SLC30A2; the disease is Zinc deficiency.