According to numerous studies, carriers of several SNPs in the human FTO gene are genetically predisposed to T2DM, T1DM, GDM, and chronic diabetic complications (Benak et al., 2023b; Hubacek et al., 2018a; Younus et al., 2017; Hubacek et al., 2023; Ghafarian-Alipour et al., 2018; Chaudhary et al., 2024; Mosaad et al., 2024; Zhang et al., 2023; Amin et al., 2023; Amine Ikhanjal et al., 2023; Zano and Baig, 2022). This evidence concerns the gene FTO and type 2 diabetes mellitus.