GCG and diabetes mellitus: Various previous studies have shown that seeds of kidney bean have α-amylase inhibitors inhibiting α-amylase activities in animals and insects, related to control type-2 diabetes mellitus by inhibition of DPP-IV, and a lectin called phytohaemoagglutinin could adjust the activity of glucagon-like peptides GLP-1 (glucagon-like peptide-1) [152,153,154].