Why Is Nutrition Important During Cancer Treatment?

March 3, 2026

Good nutrition plays an important role during cancer treatment and recovery. Food does more than provide energy — it helps rebuild tissues, support healing between treatments, and maintain strength. Nutrition can also help manage common side effects such as nausea, fatigue, or loss of appetite.

After treatment, nutrition continues to matter. During survivorship, the focus shifts to overall wellbeing, improving quality of life, and making healthy lifestyle choices that may help reduce the risk of cancer returning.

What Foods Are Helpful During and After Treatment?

Nutrition recommendations are often tailored to the symptoms you’re experiencing.

For example:

• Nausea may improve by staying hydrated.

• Eating small, frequent meals can help maintain energy.

• Avoiding high-fat foods or foods with strong smells may reduce discomfort.

When patients are able to eat well, a plant-forward approach is encouraged. This does not mean you must be vegetarian or vegan. Instead, aim for balance. The American Institute for Cancer Research recommends filling:

• Two-thirds of your plate with plant-based foods (whole grains, fruits, vegetables, beans)

• One-third with lean animal protein

Are There Foods to Avoid?

Food safety is especially important during treatment to reduce the risk of infection. Avoid:

• Unpasteurized dairy products

• Raw bean sprouts

• Unroasted nuts

• Deli meats unless heated thoroughly

Some foods and supplements — including grapefruit or Seville oranges — can interact with certain treatments. Always check with your doctor or dietitian before making major changes.

Where Can Patients Get Nutrition Support?

If you have questions, talk with your oncology care team. They can refer you to an oncology dietitian. Presbyterian currently offers oncology dietitians at the Jorgensen Cancer Center at Rust Medical Center and Presbyterian Kaseman Hospital Cancer Care.

Nutrition does not have to be complicated or stressful. Small, thoughtful changes can improve strength and quality of life. We also offer virtual cook-along and emotional support classes for cancer survivors throughout the year at prescommhealthclasses.com/event-list. Use the password "Healthy" to register.

For more information about more resources provided by Presbyterian Cancer Care, visit us online at phs.org/cancer.

Clinical information provided by Nicole Ackerman, Registered Dietician with Presbyterian Cancer Care.