Dr. Mohanad Diab
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2026-03-129 min read

Written and medically reviewed by Dr. Mohanad Diab, Consultant Medical Oncologist, Mediclinic Abu Dhabi.

Nutrition During Cancer Treatment: What to Eat and What to Avoid

Nutrition During Cancer Treatment


Good nutrition is one of the most important things you can control during cancer treatment. What you eat can affect how well you tolerate chemotherapy, how quickly you recover, and even how effective your treatment is.


Why Nutrition Matters During Cancer Treatment


  • Maintains strength and energy: for treatment
  • Supports immune function: — critical during chemotherapy
  • Helps repair healthy tissue: damaged by treatment
  • Reduces treatment side effects: like nausea and fatigue
  • Prevents malnutrition: which can delay treatment

    • What to Eat During Chemotherapy


    High-Protein Foods (Essential)

    Protein helps repair tissue and maintain muscle mass:

  • Lean meats (chicken, fish, turkey)
  • Eggs
  • Greek yogurt and dairy
  • Legumes (lentils, chickpeas, beans)
  • Nuts and seeds

    • Fruits and Vegetables

    Rich in antioxidants and vitamins:

  • Berries (blueberries, strawberries)
  • Leafy greens (spinach, kale)
  • Sweet potatoes
  • Broccoli and cauliflower
  • Citrus fruits (if no mouth sores)

    • Whole Grains

    Provide sustained energy:

  • Oatmeal
  • Brown rice
  • Whole wheat bread
  • Quinoa

    • Healthy Fats

    Important for nutrient absorption:

  • Olive oil
  • Avocados
  • Fatty fish (salmon, sardines)
  • Nuts

    • What to Avoid


  • Raw or undercooked meat/fish: — Infection risk during low immunity
  • Unpasteurized dairy: — Bacterial contamination risk
  • Excessive sugar: — May promote inflammation
  • Alcohol: — Can interact with medications and worsen side effects
  • Grapefruit: — Interacts with many cancer medications
  • Supplements without doctor approval: — Some can interfere with treatment

    • Managing Common Eating Challenges


    If You Have Nausea

  • Eat small, frequent meals (every 2-3 hours)
  • Try bland foods: crackers, toast, rice
  • Avoid strong smells
  • Ginger tea can help settle the stomach

    • If You Have Mouth Sores

  • Choose soft, moist foods
  • Avoid acidic, spicy, or rough-textured foods
  • Use a blender for smoothies and soups
  • Rinse mouth with salt water before eating

    • If You Have No Appetite

  • Eat small portions throughout the day
  • Make every bite count — choose nutrient-dense foods
  • Protein shakes or smoothies can be easier to consume
  • Light exercise before meals can stimulate appetite

    • If You Have Taste Changes

  • Try new seasonings and marinades
  • Use plastic utensils if foods taste metallic
  • Cold foods may be more palatable
  • Lemon drops can help freshen taste

    • Hydration is Critical


  • Aim for 8-10 glasses of water daily
  • Increase fluids if you have diarrhea or vomiting
  • Herbal teas, broths, and coconut water are good alternatives
  • Avoid caffeinated beverages in excess

    • The Role of Supplements


    Always discuss supplements with your oncologist before taking them:


  • Vitamin D: Often recommended if levels are low
  • Iron: May be needed for anemia
  • Probiotics: May help with digestive issues (check with doctor)
  • Avoid: High-dose antioxidants during chemotherapy (may interfere with treatment)

    • Dr. Diab's Nutritional Support Approach


    At Mediclinic Abu Dhabi, Dr. Mohanad Diab works with a dedicated oncology dietitian to provide:


  • Personalized nutritional assessments
  • Meal plans tailored to treatment type and side effects
  • Ongoing dietary adjustments as treatment progresses
  • Nutritional supplements when medically indicated

    • Proper nutrition is a powerful ally in your cancer treatment. Discuss your dietary needs with Dr. Mohanad Diab at Mediclinic Abu Dhabi.

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