Nutrition & Exercise During Breast Cancer Treatment

What is the recommended diet during breast cancer treatment?

Maintaining good nutrition during chemotherapy, radiotherapy, and hormone therapy is essential for preserving physical strength, supporting immune function, repairing healthy tissue, and minimizing treatment delays. According to NHS dietitians and the World Cancer Research Fund (WCRF), there is no single 'superfood' or extreme diet that cures cancer, but a wholesome, nutrient-dense diet provides the building blocks your body needs.

Key nutritional recommendations include consuming adequate protein (chicken, fish, eggs, tofu, beans, lentils, dairy) to rebuild cells; eating plenty of colorful vegetables and fruits for fiber and micronutrients; choosing complex carbohydrates (oats, brown rice, wholemeal bread) for steady energy; and drinking 1.5 to 2 liters of fluid daily to stay hydrated and assist kidney function in flushing out chemotherapy by-products.

Who this guide is NOT for: patients needing specialized parenteral nutrition or severe clinical eating disorder support — consult your hospital Macmillan dietitian for personalized clinical meal planning.

How do you manage taste changes, nausea, and appetite loss?

Chemotherapy and targeted therapies often temporarily alter taste buds, cause metallic mouth sensations, or trigger nausea. Practical NHS dietitian tips to manage these symptoms include:

• Managing Nausea: Eat small, frequent meals or snacks every 2 to 3 hours rather than large heavy meals. Dry toast, crackers, ginger tea, and cold or room-temperature foods produce fewer strong aromas that trigger nausea.
• Overcoming Metallic Taste: Use plastic or wooden cutlery instead of metal utensils. Marinate meats in fruit juices or herbs, and add lemon juice or mint to cold water.
• Managing Sore Mouth (Mucositis): Choose soft, moist, non-acidic foods (soups, stews, smoothies, scrambled eggs, yogurt). Avoid crunchy, salty, spicy, or hot foods that irritate sensitive oral tissue.
• Neutropenic Precautions: If chemotherapy lowers your white blood cell count (neutropenia), practice strict food hygiene: wash all produce thoroughly, cook meats and eggs completely, and avoid unpasteurized cheeses or raw seafood.

What physical activity guidelines should you follow during treatment?

Far from recommending complete bed rest, current NHS and MacMillan guidelines encourage staying as active as comfortably possible throughout breast cancer treatment. Groundbreaking clinical trials demonstrate that regular, light-to-moderate physical activity reduces cancer-related fatigue by up to 30%, improves mood, reduces anxiety, and helps maintain muscle mass.

The UK Chief Medical Officers recommend aiming for up to 150 minutes of moderate-intensity activity per week (such as brisk walking, gentle cycling, water aerobics, or light gardening), broken down into manageable 10 to 20-minute daily sessions. Listen to your body and rest on low-energy days.

Incorporate light resistance or weight-bearing exercises (walking, bodyweight squats, light resistance bands) 2 days a week to preserve muscle tone and protect joint flexibility.

How can nutrition and exercise protect bone health during hormone therapy?

Hormone therapies (such as aromatase inhibitors like letrozole, anastrozole, or exemestane, as well as ovarian suppression) lower oestrogen levels, which can accelerate bone density loss and increase osteoporosis risk. Protecting your bones requires an active strategy:

• Weight-Bearing Exercise: Walking, jogging, stair climbing, and dancing stimulate bone-building cells (osteoblasts) and slow bone thinning.
• Calcium-Rich Foods: Include dairy products, fortified plant milks, leafy green vegetables (kale, broccoli), canned sardines with bones, and sesame seeds.
• Vitamin D Supplementation: The NHS recommends taking a daily 10 microgram (400 IU) Vitamin D3 supplement, particularly during autumn and winter months when sunlight exposure is low.
• DEXA Bone Scans & Bisphosphonates: Your oncology team will arrange a DEXA scan to check bone density. If bone thinning is detected, bone-protecting medicines (bisphosphonates like zoledronic acid) may be prescribed.