 Primary outcome measure. The primary endpoint is change in body weight in kg, as measured from randomization to month 12. The co-primary end-point is the percentage of participants in the two groups that, at month 12, maintained the 5 reduction in body weight achieved during the 14-week dietary run-in period. Secondary efficacy endpoints include changes in CVD risk factors, glycemic control, and quality of life, as measured from randomization to month 12. Exploratory endpoints include changes in these CVD and related outcomes, as measured at the start of the 14-week run-in period to month 12. The investigators also will examine the percentage of participants in the two groups who at month 12 achieved losses of 5, 10, and 15 of initial weight, as measured from the start of the run-in period. 