Support and Tracking to Achieve Results (Project STAR)

Obesity remains a substantial public health challenge in the United States. While behavioral lifestyle interventions have been demonstrated to produce weight losses of 8-10% in adults with overweight and obesity, long-term outcomes are suboptimal, limiting effectiveness for long-term weight loss maintenance. The study team will evaluate methods for providing phone-based extended-care to support weight loss maintenance. The investigators propose to conduct a randomized controlled trial assessing the impact of phone-based extended care delivered on an ADAPTIVE (when we determine that participants are at "high risk" for weight regain) vs. STATIC (once-per-month frequency used in gold-standard extended-care programs) schedule on weight loss maintenance. Participants will be provided with an initial in-person, group-based behavioral weight management program. Participants who successfully achieve a clinically-significant weight loss between baseline and Month 4 (defined by the Institute of Medicine as a reduction in weight of ≥ 5% from baseline) will be randomized into the clinical trial. Follow-up visits will occur at Month 12 and Month 24 after initial intervention baseline.