<Study Procedures> Total of 24 study patients with type 2 diabetes mellitus who have not taken or washed out hypoglycemic drug (oral hypoglycemic drug and glucagon like peptide-1 receptor agonist) for at least 4 weeks are randomized into 3 groups (8 patients each) of high GI meal containing 55% carbohydrate group, low GI meal containing 55% carbohydrate group, and high GI meal containing 40% carbohydrate group. The energy intake of study patients in all the groups is 1800 kcal per day. Each study group patient takes the following diets for 14 days; study patients in high GI meal containing 55% carbohydrate group take 55% carbohydrate white rice diet; those in low GI meal containing 55% carbohydrate group take 55% carbohydrate brown rice diet; those in high GI meal containing 40% carbohydrate group take 40% carbohydrate white rice diet. Study patients orally receive luseogliflozin 2.5 mg s.i.d. before breakfast for 7 days from the 8th day of starting the study meal to the 14th day.