Weight Gain Prevention for Breast Cancer Survivors

The specific aims of this study are: 1. To test the feasibility of a randomized controlled trial of a weight gain prevention program for breast cancer survivors that combines exercise and dietary changes during treatment. Feasibility will be evaluated by examining data on recruitment rate, attendance at intervention sessions, drop-out rates in both study conditions, assessment completion rates, and participant feedback. 2. To test the effect of a weight gain prevention program, compared to usual care, on weight, body composition, and biomarkers related to breast cancer prognosis. 3. To explore whether changes in physical activity, energy intake, and resting energy expenditure predict weight gain among breast cancer survivors. 4. To test the effect of a weight gain prevention program on quality of life variables.