Participant Involvement: One hundred seventy overweight or obese adults will have their height and weight measured and complete a battery of questionnaires at baseline, 6 and 12 months. Participants in the intervention group will receive on average 4 texts per day consisting of weight related behavioral recommendations, knowledge based questions, and prompts to promote physical activity and weight monitoring. Texts are interactive and personally relevant based upon a baseline questionnaire. The control group will receive only monthly newsletters but not text messages. Participants in both conditions will receive monetary compensation for participation, travel to the study site, and reimbursements for text messaging.