This will be a randomized parallel, open label clinical study. Thirty overweight and obese insulin-treated T2D patients with HbA1c>7.5% will be assigned to 12 weeks of 2 isocaloric diets: either Bdiet or 6Mdiet. HbA1c and CG mRNA expression in white blood cells and overall daily glycemia measured during 5 days, will be assessed before and at the end of the diet intervention. The TDID will be adjusted by physician, according to the results of self-monitoring of blood glucose on 3 consecutive days at baseline and before each of the visits.