Nutritional Status of Head and Neck Cancer Patients

This study is tracking the nutritional status of people with head and neck cancer who are receiving radiation therapy, to understand how their body composition and nutritional health change throughout treatment and to identify those at risk of malnutrition. **You may be eligible if...** - You are 18 or older - You have been diagnosed with head and neck cancer - You are currently receiving radiation therapy at Marmara University Pendik Training and Research Hospital - You are able to communicate and cooperate during assessments **You may NOT be eligible if...** - You drank caffeine in the last 4 hours, alcohol in the last 24 hours, or exercised intensely in the last 24–48 hours (as these affect the body composition measurement) - You have a pacemaker or metal implants (which affect the measurement device) - You have communication difficulties or cognitive impairment - You are an amputee or have severe arm deformities - You are receiving nutrition through a vein (parenteral nutrition) Talk to your doctor to see if this trial is right for you.