Nutrition Management During Chemotherapy: Evidence‑Based Guidelines

General Nutritional Goals

Maintain adequate calorie and protein intake, prevent weight loss, and manage treatment‑related side effects – the American Cancer Society’s nutrition guidelines for patients receiving chemotherapy prioritize these goals to support treatment tolerance and overall health. 1
Use nutrient‑rich foods and beverages as the first line of nutritional support – guidelines recommend meeting the body’s nutrient and calorie needs through whole foods rather than isolated supplements. 1

Offer small, frequent meals and nutrient‑dense drinks – this strategy helps patients sustain adequate nutrition when appetite is reduced during chemotherapy. [1][2]
Avoid high‑dose antioxidant supplements (e.g., vitamin C or E exceeding the recommended daily value) – such supplements are controversial because they may theoretically shield cancer cells from oxidative damage caused by chemotherapy. 2
Physicians generally advise against any supplement providing more than 100 % of the daily value during active treatment – this recommendation aims to minimize the risk of unintended drug‑nutrient interactions. 1

Discuss any dietary changes, including the addition of watermelon juice, with the oncology team – coordinated care ensures that nutrition interventions align with the overall treatment plan. [1][3]

During periods of active nausea or vomiting, follow NCCN antiemetic guidelines and choose foods that are “easy on the stomach” and served at room temperature – this approach reduces the risk of exacerbating gastrointestinal symptoms. [4][5]
Monitor individual tolerance to specific foods or drinks; discontinue watermelon juice if it provokes discomfort – personalized assessment helps maintain comfort and adherence to nutritional recommendations. 6

Incorporate watermelon juice as part of a balanced, nutrient‑dense diet rather than as a standalone therapeutic agent – while it is a whole food with a favorable safety profile, it should complement, not replace, broader nutritional strategies. 1
No specific guideline recommends watermelon juice as a treatment adjunct; its use is based on general whole‑food recommendations – clinicians should therefore treat it like any other fruit‑based beverage within the overall nutrition plan.
Strength of evidence – the above recommendations are derived from guideline statements (American Cancer Society and NCCN) and are considered strong (Level A) recommendations for routine clinical practice.