GROUP I: Patients receive one 30-minute session with the research assistant for training on how to use the SparkPeople website, and may request additional training if needed. Patients are instructed to self-monitor their diet at least weekly using SparkPeople and physical activity levels daily using the Fitbit monitoring device, which integrates with the SparkPeople program. Patients receive weekly motivational reminders to log into the website for 3 months via email, text, or phone, based on patient preference (active phase). Patients then enter the maintenance phase for an additional 3 months without reminders.