Mobile Weight Loss Intervention for Adolescent and Young Adult Cancer Survivors

In order to participate in this study a subject must meet all of the eligibility criteria outlined below. Inclusion Criteria: * Currently age 18-39 * Diagnosed with first invasive cancer between the ages of 15-39 years old * Within 10 years of diagnosis with no evidence of progressive disease or second primary cancers * Completed active cancer-directed therapy (cytotoxic chemotherapy, radiation therapy, and/or definitive surgical intervention) at least six months prior to enrollment, except maybe receiving "maintenance" therapy to prevent recurrences * Body Mass Index (BMI) of 25-50 kg/m2 Exclusion Criteria: * Type 1 diabetes or currently receiving medical treatment for Type 2 diabetes * Report a history of heart attack or stroke within the previous 6 months * Health problems that preclude the ability to walk for physical activity * Lost 5% or more of body weight (and kept it off) in the last 3 months * Past diagnosis of or receiving treatment for a clinically diagnosed eating disorder (anorexia nervosa or bulimia nervosa) or any compensatory behaviors within the previous 3 months * Currently pregnant, pregnant within the past 6 months, or planning to become pregnant within the next 6 months * Untreated thyroid disease or any changes (type or dose) in thyroid medication in the last 6 months * Hospitalization for depression or other psychiatric disorder within the past 12 months * History of psychotic disorder or bipolar disorder * Currently participating in a weight loss,…