Athletes, Cancer, and Nutrition Considerations

1. Why Nutrition Matters for Athletes Facing Cancer

Highintensity training places unique demands on the body: glycogen stores must be replenished, muscle protein turnover is accelerated, and a finely tuned hormonal environment supports recovery. Cancer and its treatments (chemotherapy, radiation, surgery, immunotherapy) disrupt those same processes by:

• Increasing metabolic rate: Tumor activity and inflammatory cytokines raise resting energy expenditure.
• Inducing catabolism: Muscle breakdown is common due to reduced intake and treatmentrelated insulin resistance.
• Altering absorption: Nausea, mucositis, and gastrointestinal injury can impair nutrient uptake.
• Changing taste and appetite: Dysgeusia and loss of appetite limit energy intake.

For an athlete, these changes can mean rapid loss of strength, endurance, and body compositionall of which threaten both shortterm performance and longterm health.

2. Core Nutrition Goals During Cancer Treatment

1. Maintain Energy Balance Aim for 3035 kcal/kg body weight per day (or higher if hypermetabolism is evident). Small, frequent meals and caloriedense foods (nut butters, smoothies, fortified drinks) help meet targets.
2. Preserve Lean Body Mass Provide 1.21.5g protein/kg body weight daily. Prioritize highquality sources such as whey, lean meat, fish, eggs, soy, and dairy.
3. Support Immune Function Ensure adequate intake of vitaminsA,C,D,E, zinc, selenium, and omega3 fatty acids.
4. Manage Treatment SideEffects Use specific dietary strategies to counter nausea, constipation, diarrhea, and mouth sores.
5. Facilitate Recovery and Return to Training Align posttreatment nutrition with the athletes periodised training plan (e.g., carbohydrate periodisation for glycogen restoration).

3. Practical Meal Planning Strategies

3.1 EnergyDense Snacks

When appetite is low, focus on foods that pack calories in a small volume:

• Nut butter blended into smoothies with banana, Greek yogurt, and honey.
• Avocado toast with poached egg and a sprinkle of chia seeds.
• Wholegrain granola with fullfat milk or fortified plant milk.
• Energy bars that contain at least 250kcal per serving and a balanced macronutrient profile.

3.2 Protein Prioritisation

Distribute protein evenly across 46 meals to maximise muscle protein synthesis. Example:

• Breakfast: 20g whey protein shake.
• Midmorning: Greek yogurt with berries (15g protein).
• Lunch: Grilled chicken breast, quinoa, and roasted vegetables (30g protein).
• Afternoon snack: Cottage cheese with sliced peach (15g protein).
• Dinner: Baked salmon, sweet potato, and steamed broccoli (35g protein).
• Evening: Casein protein drink (20g protein) before bedtime.

3.3 Hydration and Electrolytes

Cancer therapies often cause fluid shifts. Athletes should drink 23L of fluid daily, plus additional intake during training. Include electrolytes (sodium, potassium, magnesium) especially after night sweats or vomiting.

3.4 AntiInflammatory Fats

Omega3 fatty acids (EPA/DHA) have shown benefit in reducing treatmentrelated inflammation and preserving muscle mass. Aim for 12g per day via fatty fish (salmon, sardines), algae supplements, or flaxseed oil.

4. Tailoring Nutrition to Specific Treatments

4.1 Chemotherapy

Common sideeffects: nausea, taste changes, mucositis.

• Use ginger tea or ginger supplements for nausea.
• Choose bland, soft textures (pureed soups, oatmeal, mashed potatoes).
• Incorporate mouthsoothing foods like gelatin, smoothies, and cold items.

4.2 Radiation Therapy (Head/Neck)

Risk of severe oral mucositis and dysphagia.

• Focus on highprotein, highcalorie liquids (e.g., fortified milkshakes).
• Avoid acidic or spicy foods that irritate mucosa.
• Consider nutrition supplements such as Peptamen or Ensure Plus.

4.3 Surgery

Postoperative goals: wound healing, restoration of intake.

• Prioritise zinc (15mg/day) and vitaminC (500mg/day) for collagen synthesis.
• Begin with easily digestible proteins (egg whites, whey) before progressing to solid foods.

4.4 Immunotherapy

May cause colitis or diarrhea.

• Increase soluble fiber (e.g., oatmeal, psyllium) to bulk stools.
• Stay hydrated and replace lost electrolytes.
• Probioticrich foods ( kefir, yogurt) may help maintain gut integrity.

5. Micronutrient Spotlight

6. Integrating Nutrition with Training Cycles

Once acute treatment effects subside, athletes can reintroduce structured training. Nutrition should mirror the periodisation model:

• Recovery Phase (Weeks 12 posttreatment): Emphasise protein (2.0g/kg), moderate carbs (34g/kg), and high fluid intake.
• Reconditioning (Weeks 36): Gradually increase carbohydrate intake to 56g/kg to refill glycogen as training volume rises.
• Peak Performance (Weeks 7+): Match carbohydrate periodisation to competition schedule (e.g., 710g/kg on highintensity days, 34g/kg on light days).

Monitoring tools such as body composition analysis, resting metabolic rate testing, and blood panels help finetune intake.

7. Psychological and Social Aspects

Eating challenges during cancer are often linked to anxiety, depression, or isolation. Strategies to support mental health include:

• Involving a sportregistered dietitian experienced in oncology.
• Scheduling meals with teammates or family to make eating a social event.
• Using mindfuleating techniques to reduce stress around food.
• Keeping a food and symptom journal to identify patterns and successes.

8. Resources and Professional Support

Athletes should consider multidisciplinary care that includes:

• Oncologist and sports medicine physician.
• Registered dietitian with a sports and oncology specialty.
• Physical therapist or certified strength & conditioning specialist.
• Psychologist or counsellor familiar with cancer survivorship.

Useful online resources:

• American Cancer Society
• U.S. Department of Agriculture Nutrition
• American College of Sports Medicine
• National Cancer Institute

9. Key Takeaways

1. Energy and protein needs rise dramatically during cancer treatment; aim for caloriedense, highprotein foods.
2. Targeted micronutrients (vitaminD, C, zinc, selenium, omega3) help mitigate sideeffects and support recovery.
3. Tailor nutrition to the specific treatment modalityaddress nausea, mucositis, or diarrhea with appropriate food textures and timing.
4. Integrate nutrition into the athletes training periodisation once medical clearance is granted.
5. Psychosocial support and a multidisciplinary team are essential for optimal outcomes.

With a proactive, evidencebased nutrition plan, athletes can navigate the challenges of cancer treatment, preserve performance capacity, and emerge stronger for the next chapter of their sporting career.