GIP and type 2 diabetes mellitus: The aim of the present study is to evaluate the efficacy of miglitol alone and in combination with sitagliptin on changes in blood glucose levels, precisely evaluated by a continuous glucose-monitoring system (CGMS) [21-23], and determine the effect of these agents on changes in insulin, 1,5-anhydroglucitol (1,5 AG), glucagon, GLP-1, and GIP levels in subjects with type 2 diabetes.