GCG and type 2 diabetes mellitus: Although the success of GLP‐1 analogs/mimetics in the treatment of type 2 diabetes and the correlation of strongly elevated postprandial GLP‐1 levels after Roux‐Y gastric bypass surgery43 strongly suggests benefits of recruiting endogenous GLP‐1 reserves as a not yet exploited treatment alternative, the situation for GIP is less clear.