GIP and Hyperglycemia: Our three hypotheses were that (1) reducing the carbohydrate content of the diet from 60% to 30% will reduce postprandial glycemia and insulin responses at both meals and abolish evening postprandial hyperglycemia; (2) exercise will have an independent effect on postprandial glucose tolerance and insulin response; and (3) changes in postprandial insulin responses will be affected by incretins GIP and GLP-1.