Overnight Fasting After Completion of Therapy: The OnFACT Study

Overnight Fasting After Completion of Therapy: The OnFACT Study

The purpose of this study is to test whether regularly not eating for at least 14 hours overnight ("intermittent fasting") is feasible and can improve blood sugar.

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