The dietary intake of nopal (O. ficus-indica) improves the postprandial response of glucose, insulin, glucose-dependent insulinotropic peptide (GIP) index, and the glucagon-like peptide 1 (GLP-1) index on T2DM patients after consumption of a high-carbohydrate or high-soy-protein breakfast [80]. This evidence concerns the gene GCG and type 2 diabetes mellitus.