 - Arm I 12-week Internet-based weight-loss intervention: Patients attend an in-person 60-minute session with a health educator. The health educator will review the patients weight history, current eating habits, prior and current level of physical activity, reasons for wanting to lose weight, current weight, weight-loss goals, and barriers to weight loss. The health educator will provide basic weight-loss advice for the patient, according to established guidelines, and advice on diet modification to reduce caloric intake. The health educator will also recommend gradual increases in physical activity and help patients set a realistic target weight to achieve at the end of the 12-week intervention period. 