Furthermore, research has identified new links between the polymorphic loci in the GRIN1 gene (rs6293) and external eating behaviors in individuals with type 2 diabetes, as well as associations of the GRIK3 (rs534131) and GRIA1 (rs2195450) genes with diabetic retinopathy (Kochetova et al., 2020). This evidence concerns the gene GRIN1 and type 2 diabetes mellitus.