Ketogenic Diet Compliance in Patients Undergoing Radiotherapy for Pelvic Cancers

Some days before the start of radiotherapy there will be the first visit in which patients will be enrolled and placed in one of the following two groups:

• The intervention group (KD) will be prescribed a ketogenic diet therapy plan characterized by the following composition: carbohydrates < 30g/day, 1.2g-1.5g protein/kg/day and lipids > 65%.
• The control group (SD) will be prescribed a nutrition plan based on the Mediterranean diet model according to ESPEN guidelines (carbohydrates 45-55%, protein 15-20% and lipids 30-35%) There will then be two additional follow-ups for patients: one during the period of therapy and one at the end of therapy.

Compliance with diet therapy treatment (SD vs. KD) will be assessed by analysis of a food diary that the patient will be asked to complete.

During follow-ups it will be assessed:

• BMI and body composition (by bioimpedance analysis)
• Muscle strength and physical performance (by hand grip test and sit-to-stand test) Compliance with and toxicity of radiochemotherapy treatment will be assessed at the radiochemotherapy visits (3 visits during treatment)

Inclusion criteria

• Histologic confirmation of rectal adenocarcinoma
• Locally advanced rectal cancer
• Patients undergoing neoadjuvant radiotherapy treatment
• Signature of informed consent to the processing of personal data

Exclusion criteria

• Severely malnourished patients according to GLIM (Global Leadership Initiative on Malnutrition) criteria
• Patients treated for palliative purposes
• Patients with metastatic disease
• Diabetes mellitus
• Pregnancy or lactation
• Significant food allergies that would make the person unable to consume the food provided
• Refusal to participate in the proposed clinical trial