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Nutrition During Chemotherapy: Evidence-Based Eating Strategies for Patients

Chemotherapy affects appetite, taste, digestion, and nutrient needs. While individual needs vary, these evidence-based principles support strength, immunity, and recovery.

Core Nutritional Priorities

1. Adequate Protein

Goal: 1.2–1.5 g/kg body weight daily (unless kidney disease).

  • Lean meats, poultry, fish, eggs
  • Greek yogurt, cottage cheese, kefir
  • Legumes, lentils, tofu, tempeh, edamame
  • Nuts, seeds, nut butters
  • Protein powders (whey, pea, soy) if intake is low

2. Colorful Fruits & Vegetables

Goal: 5+ servings/day for antioxidants, polyphenols, fiber.

  • Berries, citrus, melons, apples
  • Cruciferous veg (broccoli, cauliflower, kale)
  • Orange/red veg (carrots, sweet peppers, squash)
  • Cooked if raw causes irritation; smoothies well-tolerated

3. Whole Grains & Complex Carbs

Provide sustained energy, B vitamins, fiber for constipation prevention.

  • Oats, quinoa, brown rice, barley, farro
  • Whole-grain bread, pasta, crackers
  • Sweet potatoes, winter squash

4. Healthy Fats

Reduce inflammation, support cell membranes, aid fat-soluble vitamin absorption.

  • Extra-virgin olive oil, avocado oil
  • Avocados, olives
  • Fatty fish (salmon, sardines, mackerel) 2×/week
  • Walnuts, chia, flax, hemp seeds

5. Hydration

Goal: 2–3 L/day unless fluid-restricted.

  • Water, herbal teas, broth, electrolyte drinks
  • Limit caffeine/alcohol
  • Sip continuously; don't wait for thirst

Managing Common Side Effects

Side EffectDietary Strategies
NauseaSmall, frequent meals; cold/room-temp foods; ginger, peppermint; avoid strong odors
Taste changes (dysgeusia)Plastic utensils; marinate meats; add lemon/herbs; try tart flavors if no mouth sores
Mouth sores (mucositis)Soft, bland, lukewarm foods; avoid acidic/spicy/salty/crunchy; use straw
DiarrheaLow-fiber, binding foods (BRAT); soluble fiber (oats, banana); probiotics; hydrate
ConstipationIncrease fluids + insoluble fiber (prunes, bran); gentle movement
FatiguePrep-ahead meals; nutrient-dense snacks; accept help; consider meal delivery

Foods to Limit

  • Processed meats, fried foods, excess sugar
  • Alcohol (interacts with many chemo drugs)
  • Unpasteurized dairy, raw fish/eggs (if neutropenic)
  • Supplements without oncologist approval (antioxidants may interfere with treatment)

When to See an Oncology Dietitian

  • Unintentional weight loss >5% in 1 month
  • Inability to eat/drink for >24 hours
  • Tube feeding or TPN consideration
  • Special diets (renal, diabetic, etc.)

Always coordinate with your oncology team. Nutritional needs change throughout treatment cycles; personalized guidance optimizes tolerance and outcomes.

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