Effect of mini-low carbohydrate diet on glucose metabolism in patients with type 2 diabetes: open-label randomized controlled study

INTERVENTION: Moderate diet group A nationally registered dietitian guides a calorie‐restricted diet of 25‐30kcal/IBW day using a food exchange list.Periodic guidance is repeated during the 3months study period. Mini low carbohydrate diet group A nationally registered dietitian guides a diet 25‐30kcal/IBW/day for breakfast and lunch.Only carbohydrate is restricted at dinner within same calorie. Periodic guidance is repeated during the 3months study period. CONDITION: Type2diabetes mellitus PRIMARY OUTCOME: Change in HbA1c SECONDARY OUTCOME: 1. Change in fasting plasma glucose,1,5‐Anhydroglucitol,glycated albumin,fasting plasma insulin; 2. Change in body weight,waist circumference,body composition and basal energy expenditure.; 3. Change in Lipid profile(LDL‐C,HDL‐C,TG); 4. Level of performance of dietary management(intake energy and nutrition survey); 5. Level of satisfaction with therapy,quality of life(questionary survey) INCLUSION CRITERIA: 1. Patients with type 2 diabetes. 2. Age more than 20 3. Under treatment with no antidiabetic agents, or with oral hypoglycemic drugs. 4. Patients with Hb1c less than 8.5% at entry.