Lean Body Mass in Head and Neck Cancer Patients During Cisplatin-based Chemoradiation

The goal of this clinical trial is to investigate the changes in body composition in head and neck cancer patients during treatment. The main questions it aims to answer are: What is the rate of lean body mass loss and how is it associated with changes in muscle strength and functional performance? Is the lean body mass loss impacted by adding chemotherapy to the radiation treatment? Participants will be asked to undergo five body composition scans during treatment and undergo tests for muscle strength and functional performance before and after treatment.