However, the degree to which GLP-1 is responsible for the metabolic success after bariatric surgery is continually debated [6] with studies suggesting that GLP-1 is one of the best predictors of T2D remission after RYBG [13], and other findings showing that the increased GLP-1 secretion is not enough to maintain normal glucose tolerance [14]. The gene discussed is GCG; the disease is type 2 diabetes mellitus.