Fasting-mimicking Diet Intervention on Side Effects of Aromatase Inhibitors Treatment in Patients With Breast Cancer

This study is testing whether a fasting-mimicking diet — a temporary, low-calorie eating plan that makes the body think it is fasting — can reduce the side effects of aromatase inhibitor medications used in breast cancer treatment. These side effects often include joint pain, bone loss, and high cholesterol. The diet would be done in cycles alongside ongoing medication. **You may be eligible if...** - You are 18 years or older with early-stage, hormone receptor-positive breast cancer - You are currently taking aromatase inhibitors (for at least 6 months) - You have elevated cholesterol (total cholesterol over 200 mg/dL) - Your overall health allows safe participation **You may NOT be eligible if...** - You have evidence of cancer spread (metastatic disease) - You are currently on other investigational treatments - You have inadequate kidney, liver, or blood function - You have active bone metastases Talk to your doctor to see if this trial is right for you.