Administration of ONS Based on Purple Sweet Potato in Head and Neck Cancer Patients With Radiotherapy

The goal of this clinical trial is to compare the effect of local food-based oral nutritional supplements (ONS) containing immunonutrients (omega-3 and anthocyanins) on nutritional status and inflammatory response in head and neck cancer patients receiving radiotherapy. The main questions it aims to answer are: * Is there any effect of local food-based oral nutritional supplements (ONS) containing immunonutrients (omega-3 and anthocyanins) on the nutritional status? * Is there any effect of local food-based oral nutritional supplements (ONS) containing immunonutrients (omega-3 and anthocyanins) on inflammatory response? Participants will participants will receive ONS in powder form ready to brew as much as 2 servings per day for 3 weeks. Researchers will compare the effect of giving ONS containing immunonutrients compared to standard ONS to see the effect on nutritional status and inflammatory response