Overnight Fasting After Completion of Therapy: The OnFACT Study

Inclusion Criteria: * Body mass index is ≥ 18.5 kg/m\^2 * History of treatment for cancer or related illness diagnosed at ≤ 25 years old * Off cytotoxic therapy for primary cancer ≥ 2 years * Not receiving cytotoxic therapy (chemotherapy, external beam radiation therapy) at the time of study enrollment * History of radiation to the chest, abdomen or total body * Current age ≥18 years * English-speaking * Personal phone with SMS text messaging capability * Willingness to wear an mHealth device, such as a FitBit, for two 7-day periods * Able to perform all study requirements Exclusion Criteria: * Use of any antidiabetic, weight loss, or appetite control medication * Use of any other medication that could impact dietary intake, such as prednisone * Currently fasts 12 hours or more by self-report * Unable to fast due to medical reason such as pregnancy