Time Restricted Eating for the Improvement of Outcomes in Patients With Stage I-III Breast Cancer Receiving Chemotherapy Before Surgery

This study is testing whether time-restricted eating (limiting food consumption to a specific window of hours each day) during chemotherapy before breast cancer surgery can improve treatment outcomes in overweight or obese patients. **You may be eligible if...** - You are 18 or older with a BMI between 25 and 40 - You have been newly diagnosed with invasive breast cancer (stage I–III) - Your tumor is HER2-negative - Your doctor has recommended at least 16 weeks of chemotherapy before surgery - You have a personal email address and internet access **You may NOT be eligible if...** - Your cancer is stage T4 (including inflammatory breast cancer) - You have already received treatment for this breast cancer diagnosis - You are pregnant or breastfeeding - You have type 1 diabetes or type 2 diabetes treated with insulin - You have a history of an eating disorder - You work night shifts Talk to your doctor to see if this trial is right for you.