Insulin is a pancreatic hormone that controls our blood sugar levels. Insulin not only stimulates the uptake of glucose from blood into peripheral tissues, it also acts on the brain, specifically the hypothalamus, to control glucose and energy metabolism. In obese subjects, insulin loses some of its activity due to the activation of inflammatory signaling and a subsequent impairment of the cellular response downstream to the insulin receptor. This phenomenon, termed insulin resistance, is a major hallmark in the development of type 2 diabetes, but to date not yet fully understood. Recent genome-wide association studies (GWAS) identified DUSP8 as type 2 diabetes risk gene. Now, scientists have investigated how the protein Dusp8 (dual-specificity phosphatase 8), which is encoded by the DUSP8 gene, regulates glucose tolerance and insulin sensitivity.