Fifty participants will be assigned to each of the study arms. The Standard and Armband groups will participate in weekly group counseling sessions for four months. During months 5-7 study staff will contact participants weekly via email or telephone to monitor their reports of dietary and physical activity logging, and to provide counseling support as necessary. During months 8 and 9, these contacts will be monthly. For the Armband Alone group, study staff will make monthly contact by telephone or email to answer questions and provide encouragement.