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🌱 The role of nutrition in cancer treatment
Why what you eat matters during chemotherapy and radiotherapy.
Why nutrition matters more in cancer
Cancer treatment puts a significant strain on the body. Chemotherapy, radiotherapy and surgery increase the body's energy and protein needs. On top of this, common side effects — nausea, loss of appetite, mucositis — make it hard to keep up an adequate food intake. Without proper nutrition, the risk of clinical malnutrition rises, which can lead to treatment being interrupted or reduced.
What the international guidelines say
According to the ESPEN Guidelines on Nutrition in Cancer Patients (2021), every cancer patient should be assessed nutritionally at diagnosis and throughout treatment. The Canadian Cancer Society recommends maintaining body weight and muscle mass as the main goals. Memorial Sloan Kettering emphasises that there is no proven "anti-cancer diet", but there are nutritional principles that support quality of life and tolerance to treatment.
Not about perfection, but about support
The aim of cancer nutrition is not to radically change what you eat, but to give your body the resources it needs. Sometimes, a day when you managed to eat something — anything — is a good day. A gentle approach, adapted to how you feel, is more valuable than a strict regimen you cannot follow.
Key points
What to remember from this article
- ✓Nutrition supports tolerance to treatment and reduces complications
- ✓Every cancer patient should be assessed nutritionally at diagnosis
- ✓The goal is to support the body — not the perfect diet
- ✓Maintaining muscle mass and weight are important indicators
Related practical guides
Concrete tips for similar situations
Medical note
The information in this article is for guidance only and is based on international guidelines (ESPEN, Canadian Cancer Society, Memorial Sloan Kettering). It does not replace individualized medical advice. Discuss any nutrition decision with your medical team or an oncology nutritionist.
Sources
- ESPEN Guidelines on Nutrition in Cancer Patients, 2021
- Canadian Cancer Society – Nutrition and cancer
- Memorial Sloan Kettering Cancer Center – Nutrition and Cancer