GCG and type 2 diabetes mellitus: Emphasizing the importance of GLP-1-mediated inhibition on gastric emptying for the regulation of blood glucose, antagonizing GLP-1’s effect on gastric emptying by co-infusion of GLP-1 with erythromycin during a liquid meal diminished GLP-1’s ability to decrease post-prandial hyperglycemia in patients with T2D (79).