App helps young cancer survivors shed pounds

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

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, nutrition, or physical activity study or program or other study that would interfere with this study * Currently using prescription medications with known effects on appetite or weight. * Previous surgical procedure for weight loss or planned weight loss surgery in the next 6 months * Inability to speak and read English * Do not have an iPhone with active data and text messaging plan * No Internet access * Not willing to be randomized to either intervention arm