Any heart condition that limits ability to participate in physical activity

Chest Pain

Any cognitive of physical limitation that would preclude use of a smartphone

Serious mental illness

Historical or current eating disorder

Previous or planned bariatric surgery

Use of weight loss medication

Recent pregnancy or a plan to become pregnant in the next 6 months

Participation in a study at the Weight Control and Diabetes Research Center within the last two years

A weight loss of greater than 5% body weight in the last 6 months

Improving Behavioral Weight Loss Via Electronic Handheld Device