Examining Valence-based Effects in Self-Monitoring Feedback Messages

This micro-randomized factorial trial is designed to provide information about how to optimize self-monitoring feedback within a behavioral weight management intervention. All participants will attend a "Weight Loss 101" session that covers foundational weight loss education and behavioral skills training. During this session, they will also learn how to use study-provided tools to track their dietary intake, physical activity, and weight. Each weekly feedback message will be composed by a trained interventionist. Participants will be randomized each week to one of the two conditions to examine how the tone and composition of feedback messages impact participant behaviors and weight loss. The main questions that this study aims to answer are: * How does the composition of supportive feedback and ideas for potential changes in dietary or physical activity behaviors impact weight loss. * How is this feedback affected by individual or contextual factors?