Insulin and glucagon secretion: nondiabetic and diabetic subjects. Insulin and glucagon secretion: nondiabetic and diabetic subjects. In nondiabetic subjects (left panel), glucose-stimulated insulin and amylin release from the β-cells results in suppression of postprandial glucagon secretion. In a subject with type 1 diabetes, infused insulin does not suppress α-cell production of glucagon. Adapted from Ref. 38. Stephen L. Aronoff et al. Diabetes Spectr 2004;17:183-190 ©2004 by American Diabetes Association