Prolonged Nightly Fasting in Breast Cancer Survivors

This research study involves fasting (not eating any food or drinking fluids that contain calories) for 13 hours nightly for 12 weeks. * It is expected that about 40 people will take part in this research study. * Eligible participants will undergo baseline assessments prior to starting the intervention. * Baseline assessments include measurements of weight, height, quality of life, fatigue, mood, levels of physical activity, and blood markers. * Assessments will be repeated at the completion of the 12-weeks This is a a Feasibility Study, which means this is the first time that investigators are examining prolonged nightly fasting and its effect on breast cancer survivors body size, blood markers, quality of life, emotional regulation, fatigue and level of physical activity.