Table Of Contents
- Understanding Healthy Eating During Radiation Therapy
- Benefits of a Healthy Diet During Radiation
- Three Diets Radiation Patients Have Found Helpful
- The Rainbow Diet
- A Well-Rounded Diet
- Other Tips to Boost Protein/Calories
- Carbohydrates
- Fats
- Nutrition for Managing Radiation Side Effects
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We are committed to ensuring you receive the highest standard of care. Part of that care is keeping you informed about how nutrition can support your treatment and recovery. If you have any questions or concerns, please speak with your doctor or medical team.
Understanding Healthy Eating During Radiation Therapy
Nutrition is an essential component of a healthy lifestyle and plays an even greater role during radiation treatment. Eating well can increase your chances of successful treatment and improve your quality of life both during and after therapy. As your body works to heal and regenerate healthy tissues affected by radiation, it requires sufficient calories, protein, and nutrients. Health City is here to support you at every step, and we hope this guide helps you feel confident and empowered throughout your journey.
Benefits of a Healthy Diet During Radiation
There are multiple benefits of maintaining a healthy diet while undergoing Radiation Therapy. A healthy diet can:
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Speed up recovery – Protein is essential for tissue repair. Without enough, the body breaks down muscle, delaying healing.
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Lower the risk of infection – Protein supports a healthy immune system.
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Maintain energy and strength – Carbohydrates and fats are vital for sustaining strength and rebuilding energy.
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Manage side effects – A balanced diet may help reduce side effects such as nausea, appetite loss, taste changes, and dry mouth.
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Maintain weight – Maintaining a healthy weight supports treatment efficacy.
Three Diets Radiation Patients Have Found Helpful
Plant-based Diet Tips to Add More Plant-based Foods:
- Plant-based foods contain natural compounds — phytochemicals and antioxidants — that may help fight carcinogens and protect cells from damage. A balanced diet including whole grains, legumes, nuts, seeds, and a variety of colourful fruit and vegetables is recommended.
- Eat at least five servings of non-starchy vegetables and fruit per day
- Include whole grains or legumes in every meal (e.g. brown rice, quinoa, sweet potato, whole-wheat pasta)
- Fill two-thirds of your plate with vegetables, fruit, and whole grains
BRAT Diet
The BRAT diet—bananas, rice, apples, and toast—is helpful for managing nausea, vomiting, and diarrhoea. These foods are gentle on the stomach, easy to digest, and low in fat and fibre.
The Rainbow Diet
This diet encourages eating a variety of colourful fruits and vegetables to ensure a wide range of nutrients.
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Red: Tomatoes, strawberries, red peppers — rich in vitamin C and antioxidants
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Orange/Yellow: Carrots, sweet potatoes, oranges — sources of beta-carotene and potassium
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Green: Spinach, broccoli, kale — high in vitamins A, C, and K
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Blue/Purple: Blueberries, aubergine, purple cabbage — contain anthocyanins for heart and brain health
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White: Garlic, cauliflower, onions — provide potassium, magnesium, and vitamin C
A Well-Rounded Diet
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The Importance of Protein -
Protein is essential for healing, immunity, and muscle maintenance. Aim to include a protein source at every meal and snack. Some options are:
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Eggs
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Nuts and nut butters
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Seeds
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Tofu and soy products
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Dairy (full-fat milk, cheese)
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Poultry and fish
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Lean meats
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Legumes
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Protein powders/shakes (e.g. Ensure, Boost)
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If solid food is difficult, try meal replacement shakes such as:
Fruits and vegetables alone are not enough. For a well-rounded diet, ensure you’re also consuming enough protein, carbohydrates, and healthy fats.
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¾ cup cottage cheese or Greek yoghurt
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2 tbsp peanut butter
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1 banana
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Water and ice to blend
Peanut Butter Shake
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¾ cup cottage cheese or Greek yoghurt
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1 scoop whey protein
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½ cup berries
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¼ avocado
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Water and ice to blend
Berry Shake
Other Tips to Boost Protein/Calories
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Add Greek yoghurt or nut butter to smoothies.
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Use whole milk in cooking.
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Blend tofu into soups.
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Add avocado to meals.
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Freeze smoothies as nutrient-rich lollies.
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Spread nut butter on toast, pancakes, etc.
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Use high-calorie, high-protein supplements.
Carbohydrates
A vital energy source, carbohydrates also provide fibre to support digestion and alleviate constipation. Sources include:
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Whole grains (brown rice, wholegrain pasta/bread)
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Fibre-rich fruits (bananas, citrus fruits, kiwi, figs)
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Vegetables (broccoli, carrots, sweetcorn, kale).
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Aim for at least 2.5 cups of fruit and vegetables daily.
Fats
Healthy fats provide long-lasting energy and help transport essential vitamins. Avoid saturated and trans fats (e.g. fried foods, processed meats), and choose:
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Avocados
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Nuts and seeds
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Olive oil
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Oily fish
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Tofu and soybeans
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Flax and chia seeds
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Dark chocolate (in moderation)
Nutrition for Managing Radiation Side Effects
| Side Effect | Dietary Recommendations |
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| Mouth/Throat Pain | Choose soft, moist foods. Avoid spicy, salty, or acidic items. Use oral rinses as advised by your care team. |
| Nausea/Vomiting | Eat small, frequent meals. Avoid greasy, rich, or spicy foods. Sip clear fluids between meals. |
| Dry Mouth/Difficulty Swallowing | Stick to soft foods like soups and smoothies. Rinse with water or use artificial saliva. Maintain oral hygiene. |
| Loss of Appetite/Taste | Add calories through sauces, dressings, and high-calorie snacks. Try cold foods or experiment with flavours. |
| Dehydration | Keep hydrated with water, juices, herbal teas, electrolyte drinks, or water-rich foods. Avoid caffeine. |
| Gas, Bloating, Diarrhoea | Avoid fizzy drinks, beans, cruciferous vegetables, and sugar-free products. Eat small meals and low-fibre foods. |
| Constipation | Increase fluid and fibre intake (fruit, veg, whole grains). Gentle exercise may help. |
| Taste/Smell Changes | Try cold meals, plastic cutlery, or flavour enhancers. Avoid strong-smelling foods. Maintain oral hygiene. |
| Fatigue | Prepare meals in advance. Stay hydrated. Use ready-to-eat or frozen options when low on energy. |
Frequently Asked Questions
This is a common myth. All cells use glucose for energy, and we can’t eliminate it from our diet. Instead, choose healthier sources like fruit, vegetables, whole grains, and dairy—while reducing sugary processed foods.
There’s no strong evidence that vegetarian diets prevent recurrence. The best approach is a balanced diet rich in vegetables, fruit, whole grains, and quality protein. Reducing red meat may be recommended in hormone-sensitive cancers.
Current research shows that moderate soy consumption (e.g. tofu, soy milk) is safe and may even reduce breast cancer risk. Soy does not interfere with anti-oestrogen treatments.
