Ketogenic Diet Compliance in Patients Undergoing Radiotherapy for Pelvic Cancers

This study is testing whether patients with rectal cancer can follow a ketogenic diet (a high-fat, very low-carbohydrate diet) while undergoing radiation therapy, and whether this diet helps improve treatment outcomes. **You may be eligible if...** - You have been diagnosed with locally advanced rectal adenocarcinoma (a type of rectal cancer confirmed by biopsy) - You are scheduled to receive radiation therapy before surgery (neoadjuvant radiotherapy) - You have agreed to participate and provided consent for data use **You may NOT be eligible if...** - You are severely malnourished - You have medical conditions that make a ketogenic diet unsafe (such as liver or kidney disease, certain metabolic disorders) - You are unable or unwilling to follow a strict dietary plan Talk to your doctor to see if this trial is right for you.