Cancer-related fatigue can make even simple daily activities feel exhausting. Unlike ordinary tiredness, it may not improve completely with sleep or rest. Nutrition for Cancer Fatigue can help address nutritional needs during this time. Fatigue can occur before, during, or after cancer treatment and may affect physical energy, concentration, appetite, and overall quality of life.

Although nutrition cannot eliminate every cause of fatigue, eating adequately and managing treatment-related nutrition challenges can help support strength, energy needs, and recovery. A personalised nutrition plan can also make it easier to maintain food intake when treatment side effects affect your appetite or ability to eat. 

In this article, we explore how nutrition may support people experiencing cancer-related fatigue, which foods can help meet nutritional needs, and practical ways to make eating easier during treatment.

Key Takeaways

• Prioritise adequate nutrition: Eating enough calories, protein, and fluids can help maintain strength and support nutritional needs during cancer treatment.

• Include protein-rich foods: Eggs, yoghurt, paneer, lentils, beans, tofu, fish, and chicken can help maintain muscle mass.

• Choose manageable, energy-rich meals: Rice, roti, oats, fruits, nuts, seeds, and suitable healthy fats can help meet daily energy requirements.

• Eat smaller, frequent meals: If fatigue or poor appetite makes eating difficult, smaller meals and snacks may be easier to manage.

Table of Contents 

What Is Cancer-Related Fatigue? 

Cancer-related fatigue (CRF) is a persistent feeling of physical, emotional, or mental exhaustion associated with cancer or its treatment. It can be more intense than ordinary tiredness and may interfere with everyday activities, even when you have not done much. 

Cancer-related fatigue may not improve fully with rest or sleep. It can be associated with cancer itself, treatment side effects, poor appetite, dehydration, anaemia, sleep disturbances, and other medical or emotional factors. Learn more about cancer-related fatigue and its management. 

Common experiences may include: 

• Feeling exhausted after simple activities. 

• Having less energy to prepare meals or eat regularly. 

• Experiencing changes in appetite or food preferences. 

• Finding it difficult to concentrate. 

• Feeling physically weak or less able to carry out daily tasks. 

Fatigue can have several causes, so it is important to discuss persistent or worsening symptoms with your healthcare team rather than assuming that diet alone is responsible. 

Why Nutrition Matters for Cancer-Related Fatigue ?

Cancer and its treatment can affect appetite, digestion, taste, and the body’s ability to meet its nutritional needs. Nausea, vomiting, diarrhoea, mouth sores, and changes in taste may also make eating difficult. 

When food intake falls below what the body needs, it may become harder to maintain body weight, muscle mass, and strength. Dehydration or certain nutritional deficiencies may also contribute to tiredness and weakness. 

Research on nutritional interventions for cancer-related fatigue highlights the importance of addressing nutritional challenges in people with cancer. However, evidence that specific dietary interventions directly reduce fatigue remains limited, and nutrition should be considered as part of an individualised care plan. 

A balanced, adequate diet may help you: 

• Meet your daily energy requirements. 

• Maintain muscle mass and physical strength. 

• Support normal body functions. 

• Reduce the risk of inadequate food intake. 

• Manage certain treatment-related nutrition challenges. 

The aim is not to follow a perfect diet. It is to find manageable ways to meet your nutritional needs according to your symptoms, treatment, preferences, and medical advice. 

Nutrients That Support Energy and Strength 

Different nutrients contribute to the body’s normal functions. During cancer treatment, getting enough energy, protein, fluids, and essential micronutrients is particularly important. 

1. Protein for Muscle Maintenance

Protein helps maintain muscle tissue and supports the body’s repair processes. When food intake is low, meeting protein needs can become more difficult, especially if appetite changes or treatment side effects limit what you can eat. 

Protein-rich foods include: 

• Eggs. 

• Milk, yoghurt, and paneer. 

• Lentils, beans, and chickpeas. 

• Tofu and other soy-based foods. 

• Fish, chicken, and other meats, if included in your diet. 

• Nut butters and nuts, where suitable. 

Try including a protein source in meals and snacks that you can comfortably manage. If large meals feel difficult, smaller portions throughout the day may be more practical. 

The clinical nutrition guideline for people with cancer recommends individualised nutritional care. As a general guide, protein intake for people with cancer should usually exceed 1 gram per kilogram of body weight per day and may reach 1.5 grams per kilogram when appropriate. Your individual requirements may differ according to your health, nutritional status, treatment, and clinical condition. 

2. Carbohydrates for Energy

Carbohydrates provide energy for everyday activities. If you are struggling with fatigue or a reduced appetite, including familiar carbohydrate-rich foods can help you meet your energy needs. 

Options include: 

• Rice and roti. 

• Oats and other cereals. 

• Potatoes and sweet potatoes. 

• Wholegrain bread, where tolerated. 

• Fruits. 

• Other grains and starchy foods that suit your appetite and digestion. 

Choose foods based on what you can comfortably eat and tolerate. If you are losing weight or struggling to eat enough, your dietitian may recommend more energy-dense options rather than focusing only on high-fibre foods. 

3. Healthy Fats for Additional Energy

Fats provide concentrated energy in smaller portions, which may be useful when your appetite is low or you feel full quickly. 

Depending on your preferences and tolerance, you may include: 

• Nuts and seeds. 

• Nut butters. 

• Olive or other commonly used cooking oils. 

• Avocado. 

• Dairy foods, where suitable. 

Adding a little oil, nut butter, or another tolerated energy-rich ingredient to a meal may help increase its energy content without making the portion much larger. Your healthcare team can advise you if you have specific dietary restrictions. 

4. Vitamins and Minerals for Normal Body Functions

Vitamins and minerals support many functions, including red blood cell production, metabolism, and immune system function. For example, iron, vitamin B12, and folate are involved in healthy red blood cell production, while other nutrients have different roles in the body. 

A deficiency may contribute to fatigue in some people, but tiredness does not automatically mean that you have a nutritional deficiency. Your healthcare team can determine whether blood tests or other assessments are needed. 

Include a variety of foods where possible, such as vegetables, fruits, pulses, dairy products, nuts, seeds, and other foods suited to your treatment needs. 

Important: Do not start high-dose vitamins, minerals, herbal products, or other supplements without discussing them with your oncology team. Some supplements may interact with medicines or treatment. 

5. Fluids for Hydration

Not drinking enough fluids can contribute to dehydration, which may cause or worsen weakness and tiredness. Your fluid needs may vary depending on your treatment, symptoms, medicines, and other health conditions. 

You may find it helpful to: 

• Sip water regularly throughout the day. 

• Keep a drink within easy reach. 

• Try soups or other suitable fluids if they are easier to tolerate. 

• Follow your healthcare team’s advice if you have been given fluid restrictions. 

If vomiting or diarrhoea makes it difficult to maintain hydration, contact your healthcare team for advice.

Foods to Include in Your Diet 

There is no single food that can treat cancer-related fatigue. Instead, focus on a varied, nourishing diet that helps you meet your energy and protein needs as comfortably as possible. 

Here are some practical options: 

Choose foods according to your appetite, cultural preferences, digestion, and treatment side effects. Cooked, soft, or blended foods may be easier to tolerate during certain phases of treatment.

Food Safety During Cancer Treatment 

Some cancer treatments can weaken the immune system, making food safety particularly important. Follow your oncology team’s advice about food handling and any precautions recommended for your treatment. 

General precautions include washing hands before preparing food, cleaning kitchen surfaces, washing produce properly, separating raw and cooked foods, and cooking meat, seafood, and eggs safely. Avoid unpasteurised products and foods that may be unsafe for your individual circumstances. 

Your healthcare team can advise whether you need additional precautions based on your treatment and blood counts.

Practical Meal Strategies When You Feel Exhausted 

When fatigue is severe, shopping, cooking, and eating a full meal can feel overwhelming. Small adjustments may help you maintain food intake without adding unnecessary pressure. 

1. Eat Smaller, More Frequent Meals

A full plate can feel like a chore when you are exhausted. Eating smaller, more frequent meals may make it easier to meet your nutritional needs when your appetite is low or treatment side effects make eating difficult. 

Instead of relying on three large meals, try smaller meals and snacks at intervals that suit your appetite. 

2. Keep Easy-to-Prepare Foods Available

Preparing food may be difficult when your energy is limited. Keep convenient options available so that eating does not require much effort. 

Depending on your needs and food safety guidance, these might include: 

• Yoghurt or other suitable dairy foods. 

• Bananas or other easy-to-eat fruits. 

• Bread, crackers, or toast. 

• Boiled eggs prepared and stored safely. 

• Ready-to-heat meals prepared in advance. 

• Nuts or nut butter, if appropriate for you. 

Ask a family member or caregiver to help with shopping, cooking, or meal preparation when needed. 

3. Plan Meals Around Your Energy Levels

You may have more energy at certain times of the day. If possible, prepare meals or eat your main meal when you feel relatively comfortable. 

Batch cooking, freezing suitable portions, or preparing simple snacks in advance may reduce the effort required later. 

4. Adapt Foods to Your Symptoms

Cancer treatment can change how foods taste or feel. Some people experience nausea, dry mouth, mouth sores, swallowing difficulties, diarrhoea, constipation, or early fullness. 

Depending on your symptoms, you may find soft foods, moist meals, mild flavours, or smaller portions easier to manage. However, the right approach depends on the specific symptom and its cause. 

Tell your healthcare team about ongoing symptoms. A dietitian can help adapt your meals while ensuring you continue to meet your nutritional needs. 

5. Avoid Putting Pressure on Yourself to Eat Perfectly

Your appetite and tolerance may change from day to day. Some days you may manage regular meals; on others, smaller snacks or simpler foods may be more realistic. 

Focus on what you can manage and seek support if you are consistently unable to eat enough, are losing weight unintentionally, or are struggling to drink adequate fluids. 

Nutrition During Cancer Treatment Works Best With Movement 

Nutrition is one part of managing cancer-related fatigue. Physical activity, rest, sleep, and medical support may also play important roles. 

Research comparing different approaches to managing cancer-related fatigue suggests that exercise and psychological interventions can help reduce fatigue in some people during and after cancer treatment. 

Depending on your health and treatment plan, appropriate activity may include: 

• Short, gentle walks. 

• Light stretching. 

• Simple movement breaks throughout the day. 

• Activities recommended by a physiotherapist or rehabilitation professional. 

Start at a level that feels manageable and rest when needed. Do not push through severe weakness or dizziness. Ask your healthcare team before starting or changing an exercise routine, particularly if you have significant anaemia, balance problems, bone involvement, or other medical concerns. 

The goal is not to exercise intensely. It is to find a safe level of movement that suits your current abilities and treatment needs. 

When to Seek Professional Help 

Cancer-related fatigue can have several possible causes, including treatment side effects, anaemia, infection, dehydration, sleep problems, emotional distress, and inadequate nutritional intake. 

Contact your healthcare team if fatigue is persistent, worsening, or interfering with daily activities. Seek prompt medical advice if it occurs alongside symptoms such as fever, breathlessness, fainting, confusion, or an inability to keep fluids down. Follow any urgent-care instructions provided by your oncology team. 

You should also speak with your doctor or oncology dietitian if you: 

• Are losing weight without intending to. 

• Have a persistent loss of appetite. 

• Struggle to eat or drink enough. 

• Experience ongoing vomiting, diarrhoea, or swallowing difficulties. 

• Suspect that a medication or treatment side effect is affecting your energy. 

Your healthcare team can assess possible causes and recommend appropriate treatment or nutrition support. A personalised plan is often more useful than trying to manage fatigue through food alone. 

Final Thought 

Living with cancer-related fatigue can make everyday tasks, including eating, feel challenging. You do not have to eat perfectly, the goal is to give your body the nourishment it needs, one manageable meal at a time. 

Small, practical changes, along with appropriate medical care and personalised nutrition support, can help you work towards meeting your nutritional needs during treatment and recovery. 

Need Personalised Nutrition Support? 

At Oncoheal Nutrition, we provide personalised nutrition support for people living with cancer. Nutrition guidance can be tailored to your diagnosis, treatment, symptoms, food preferences, and individual needs. 

Visit Oncoheal Nutrition to learn more about our nutrition support services. 

Disclaimer: This article is intended for general educational purposes only and does not replace medical advice, diagnosis, or treatment. Nutritional needs vary depending on the type of cancer, treatment, symptoms, and overall health. Please consult your oncologist and a qualified oncology dietitian before making significant dietary changes or taking supplements. 

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Medical Disclaimer 

This article is intended for general educational purposes only and does not replace medical advice, diagnosis, or treatment. Nutritional needs vary depending on the type of cancer, treatment, symptoms, and overall health. Please consult your oncologist and a qualified oncology dietitian before making significant dietary changes or taking supplements.

References 

1. National Cancer Institute. Cancer Fatigue: Causes and Management. 
2. Muscaritoli M, Arends J, Bachmann P, et al. ESPEN practical guideline: Clinical Nutrition in cancer. Clinical Nutrition. 2021;40(5):2898–2913. Read the guideline on PubMed. 
3. Inglis JE, Lin PJ, Kerns SL, et al. Nutritional interventions for treating cancer-related fatigue: A qualitative review. Nutrition and Cancer. 2019;71(1):21–40. Read the review on PubMed. 
4. Mustian KM, Alfano CM, Heckler C, et al. Comparison of pharmaceutical, psychological, and exercise treatments for cancer-related fatigue: A meta-analysis. JAMA Oncology. 2017;3(7):961–968. Read the study on PubMed.