A Study to Investigate Why Overweight People Regain Weight After Losing Weight in a Behavioral Weight Loss Program

"A behavioral lifestyle program, up to 20 weeks in duration, based on interventions shown to be successful for weight loss such as the Diabetes Prevention Program (DPP), Action for Health in Diabetes (Look AHEAD), and Comprehensive Assessment of the Long-term Effects of Reducing Intake of Energy Study (CALERIE). Weekly sessions, led by experienced interventionists, will provide education and behavioral strategies for weight loss focused an energy-reduced diet and physical activity.~Participants must meet the following milestones to continue in the study:~* ≥ 2% weight loss anytime between 28 and 34 days after the start of the intervention~* ≥ 5% weight loss anytime between 140 and 146 days after the start of the intervention~* ≥ 7% weight loss by the end of 35 weeks~After achieving ≥7% weight loss followed by weight stability, participants are observed, without further intervention, for 52 weeks."