TCF7L2 and type 2 diabetes mellitus: o   The Impact of Genetic Testing for Type 2 Diabetes on Health Behaviors: “We will evaluate the impact of genetic testing for type 2 diabetes on psychological, health behavior, and clinical outcomes.” (ClinicalTrials.gov Identifier NCT01060540) The genetic test consists of SNPs in the TCF7L2, PPARG and KCNJ11 genes.