 All the patients will have a basal evaluation with an oral glucose tolerance test, lipid profile, body composition, and IMT measurement by ultrasonography; and 10 will be invited for the hyperglycemic clamp. After the basal evaluation, if the patients result with IMPAIRED FASTING GLUCOSE IMPAIRED GLUCOSE TOLERANCE, they will be invited to the intervention phase where they will be randomized to one of the two treatment groups. 