Nutrition and Cancer: Fueling Your Body for Healing
Why Nutrition Matters During Cancer Treatment
One of the most common questions I receive from patients after a cancer diagnosis is, “What should I eat?” Friends and family may offer well-meaning advice: no meat, no dairy, no soy, only green juices, more beetroot. The list is endless and often overwhelming.
While certain dietary changes may help reduce the risk of developing cancer, once a diagnosis has been made, the nutritional focus shifts. It becomes less about cancer prevention and more about supporting your body through healing and recovery.
Proper nutrition during cancer treatment is essential. It helps maintain strength, supports immune function, improves energy levels, and may reduce the severity of treatment-related side effects. You may be wondering what to eat during chemotherapy. Whether you’re undergoing chemotherapy, radiation, or surgery, eating well ensures your body has the best possible resources to fight the disease and heal.
The role of nutrition in cancer care
Cancer treatments can impact appetite, digestion, and energy. You may find yourself eating less or struggling with nausea, fatigue, or body weight changes, including weight gain or unintended weight loss. Maintaining a balanced diet helps:
- Prevent malnutrition
- Support tissue repair and immune response
- Improve energy levels and mood
- Alleviate treatment side effects such as nausea, fatigue, or constipation
A well-nourished body is better equipped to withstand treatments and recover more efficiently. Good nutrition also supports overall quality of life during and after treatment. That’s why cancer nutrition is now an integral part of care plans designed to meet both physical and emotional needs.
Key nutrients to focus on
Protein: The building block for healing Protein is vital for cell repair, muscle maintenance, and immune function. Maintaining muscle mass can be a challenge during treatment, especially for cancer patients who experience fatigue or loss of appetite.
Top sources: Lean meats, poultry, fish, eggs, beans, lentils, tofu, and low-fat dairy products. Legumes and plant-based protein sources can also meet nutritional needs while offering added fibre and lower saturated fats.
Healthy fats: For energy and immunity Healthy fats help fight inflammation and provide sustained energy. They also support nutrient absorption and help counteract the effects of weight loss.
Top sources: Avocados, nuts, seeds, olive oil, and fatty fish like salmon.
Vitamins and minerals: For immune support Micronutrients such as vitamins A, C, D, and E help strengthen the immune system and combat oxidative stress caused by cancer cells. Antioxidants from a variety of healthy foods play an important role in this process.
Top sources: Colourful fruits and vegetables, whole grains, and fortified foods. Cancer patients should talk to a care team member before taking supplements to avoid potential interactions with treatment.
Carbohydrates: For sustained energy Whole grains, fruits, and vegetables provide energy, fibre, and essential nutrients. Avoid overly processed sugars and added sugars, and instead opt for nutrient-dense carbohydrates that support healthy eating and digestive health.
Meeting changing nutritional needs
As treatment progresses, cancer patients may face a variety of challenges such as nausea, loss of appetite, or taste changes. These symptoms can lead to unintentional weight loss and reduced energy. Meeting changing nutritional needs requires flexibility and support from your care team, including a registered nutritionist or dietitian.
In some cases, small, frequent meals made up of high-protein, high-calorie foods can help maintain energy and weight. Including a variety of healthy foods ensures patients receive essential nutrients, even when appetite is limited. Caregivers can also play a supportive role in preparing balanced meals and helping patients maintain a consistent, healthy diet.
Plant-based options and dietary considerations
Many cancer survivors explore plant-based eating patterns during or after treatment. Incorporating plant-based meals can support overall wellness, especially when focused on whole foods like legumes, vegetables, whole grains, and healthy fats. These foods offer antioxidants, fibre, and important nutrients without the higher levels of saturated fats found in some animal products.
However, not all plant-based or vegetarian diets are equally nutritious. It’s important to plan carefully to ensure protein, iron, calcium, and B12 needs are met, especially when dairy products or meat are limited. Your nutritionist can help you strike the right balance based on your preferences and treatment plan.
Red meat and processed meats
Some evidence links high consumption of red meat and processed meats with certain types of cancer. While red meat can be a good source of protein and iron, moderation is key. Limiting processed meats such as sausages, deli meats, and bacon is generally recommended. Choosing lean cuts, and balancing with plant-based protein sources, supports a more varied and nutrient-dense approach.
The role of processed foods
Processed foods can be convenient, but they often contain added sugars, unhealthy fats, and sodium, which may not support a healthy diet during cancer treatment. Minimising heavily processed foods in favour of fresh, whole ingredients helps improve energy levels and supports the nutritional goals of cancer patients.
Hydration and food safety
Staying hydrated is critical, especially if you’re experiencing side effects like vomiting, diarrhoea, or decreased appetite. Hydrating options include water, herbal teas, coconut water, and broths. Avoid drinks with added sugars or excessive caffeine.
During treatment, food safety becomes more important as your immune system may be compromised. Avoid raw or undercooked meats, unwashed produce, and unpasteurised dairy products. Discuss safe food handling practices with your care team to reduce the risk of infection.
Physical activity and nutrition
Nutrition and physical activity go hand in hand in cancer care. Gentle movement, such as walking or stretching, can improve digestion, reduce fatigue, and help maintain muscle mass. Combined with healthy eating, physical activity supports better treatment outcomes and long-term wellness for cancer survivors.
Nutrition as a partner in your healing
While everyone’s journey is unique, one thing remains constant: your body needs fuel to fight and recover from cancer. Eating well doesn’t have to mean following restrictive diets or miracle food trends. Instead, focus on consuming a variety of nutrient-dense, whole foods that support your strength, healing, and well-being.
A registered dietitian or nutritionist can guide you through this process, ensuring your nutritional needs are met and your treatment side effects are managed. Nutrition plays a powerful role in oncology, not only supporting recovery but also improving day-to-day quality of life.
Always consult with your healthcare provider or a member of your care team before making major dietary changes. They can help you create a personalised nutrition plan that complements your treatment and aligns with your individual needs.
About Dr. Sharpe
Dr. Natalie Sharpe is an expert oncologist with over 20 years of experience, having trained and worked in some of the most prestigious medical institutions in the United States. Now a full-time physician with the Doctors Hospital oncology team, she treats patients with all types of cancer. However, one of her primary passions remains the management of breast cancer, a field closely tied to her early research at Columbia University.
Your Chemo Companion
At Doctors Hospital, your changing health is our primary concern. A new diagnosis of cancer can be unexpected, scary and disappointing. Your Chemo Companion is a self-guide to all things related to the treatment of your cancer. It provides the answers to some of the most asked questions from our patients. Feel free to discuss the contents of this Companion with your doctor, nurse or pharmacist.
