IL17A and obesity due to melanocortin 4 receptor deficiency: The possible involvement of MAIT cells in obesity and DM2 was investigated by Magalhaes et al. The authors showed that, although MAIT cell levels were reduced in the peripheral blood of obese and DM2 patients and unaltered in VAT and SAT, these MAIT cells exhibited a more proinflammatory phenotype, readily secreting IL-17, as well as increased activation and recruitment markers.