In a placebo-controlled study, intravenous GLP-1 infusion (0.9 pmol kg−1.min−1) in 14 healthy older individuals and 10 patients with T2DM, resulted in the slowing of gastric emptying and attenuation in the fall in BP following ingestion of a radiolabelled 75 g glucose drink [16]. The gene discussed is GCG; the disease is type 2 diabetes mellitus.