Comparative study on the degree of caloric restriction of diet as a dietary treatment for obese patients with type 2 diabetes: a multi-center prospective, randomized, comparative study

INTERVENTION: 25 kcal/IBW/day group: A nationally registered dietitian guides a calorie‐restricted diet of 25 kcal/IBW/day. Periodic instruction is repeated during the 1‐year study period. 30 kcal/IBW/day group: A nationally registered dietitian guides a calorie‐restricted diet of 30 kcal/IBW/day. Periodic instruction is repeated during the 1‐year study period. CONDITION: Type 2 diabetes mellitus PRIMARY OUTCOME: Body weight SECONDARY OUTCOME: 1. Glycemic control status (HbA1c, FPG) ; 2. Lipid profile (LDL‐C, HDL‐C, TG) ; 3. Liver function (AST,ALT,r‐GTP); 4. Continuation and performance of dietary treatment (energy intake) ; 5. Satisfaction and psychological complaints (questionnaire survey) INCLUSION CRITERIA: 1.Patients with type 2 diabetes mellitus. 2.BMI 25 or more. 3.Age, 20 to 80. 4.Patients after obtaining written informed consent.