This is a patient randomized trial in which patients will be randomized into one of two treatment arms: 1) standard primary care; or 2) primary care plus a 12-month eHealth behavioral intervention (iOTA), which includes interactive self-monitoring and feedback, tailored skills training materials, 18 telephone counseling calls, and primary care provider counseling. The primary outcome is weight change at 12 months. Participants will be 351 adult male and female patients from local community health centers with obesity and a related comorbidity.