The specific aims of this research project are to:
1. Develop a targeted delivery system for mobile health messages which focused on improving physical activity and diet, and setting healthy resolutions each week.
2. Deliver the M-TRIMM intervention, which encourages healthy behavior and the weekly renewal of health resolutions.
3. Evaluate the effectiveness of this intervention on individuals' weight loss, self-efficacy, and motivation to sustain changes in lifestyle behaviors.
4. Assess the benefit of receiving the message content only (in a paper document), versus a scheduled weekly delivery via mobile messaging.
