Exploring genes related to impaired insulin secretion and the interaction with diet in type 2 diabetes mellitus: A scoping review of observational studies

Diabetes mellitus is a metabolic disorder and a major global health concern. This scoping review aimed to systematically map current data that describe the relationship between genetic variant interactions related to insulin secretion and diet with the incidence of type 2 diabetes mellitus. A literature search was conducted through PubMed, Cochrane, EBSCO, ProQuest, and hand searching. Thirteen eligible articles were obtained from 1375 searches in the database; TCF7L2 variants were the most frequently examined and demonstrated interactions with fiber, followed by the CDKAL1 gene variant, which showed interactions mainly with dietary components, such as fats, proteins, and coffee. Statistically significant findings were also reported for IGFBP2, NOTCH2, KCNJ11, GIPR, HFE, and ZBED3 variants. Nevertheless, most of these studies are yet to be replicated, and some findings indicated inconsistencies. Gene interactions related to insulin secretion and diet play important roles in the risk of type 2 diabetes, although further research is required to validate these findings. © 2025 Elsevier Ltd