Could a monthly 5-Day diet ease breast cancer treatment side effects?

This study tests whether a special low-calorie diet that mimics fasting, taken for 5 days each month for 6 months, can lower cholesterol and reduce side effects from aromatase inhibitors in post-menopausal breast cancer patients. Sixty women on hormone therapy will be randomly assigned to either the diet plus nutritional counseling or counseling alone. The main goal is to see if the diet is feasible and safe, and whether it helps lower total cholesterol.