In contrast with obesity, the pro-inflammatory cytokine-producing T helper type 1 (TH1) cells, CD8+ cytotoxic T cells, and NK cells that produce IFNγ (Kammoun et al., 2014; Deng et al., 2016) become abundant in the adipose tissue due to excess leptin, which leads to M1 macrophage accumulation and polarization (Deng et al., 2016). Here, CD8A is linked to obesity disorder.