2013). However, the importance of the DAT1 VNTR should not be discarded in light of a recent meta‐analysis of in vivo imaging studies which found that DAT1 VNTR genotype has functional consequences on DA transporter activity (Faraone et al. 2014). Thus, future studies are needed to completely understand the role of the DAT1 VNTR in cognitive performance in T2D‐affected individuals. This evidence concerns the gene SLC6A3 and type 2 diabetes mellitus.