If you feel unsure about how to manage your diet during or after breast cancer treatment, this booklet is for you. It’ll give you tips on how to eat a healthy, balanced diet and how to manage the effects of treatment on your diet.
Even though we’ve included a lot of information about following a healthy diet, it’s important not to feel guilty if you don’t stick to it all the time – especially while you’re coping with the
other physical and emotional effects of breast cancer and its treatment. It’s just about getting the balance right.
Lots of people look for conclusive lists of what they can and cannot eat during and after breast cancer treatment. But we can’t always say whether you should eat or avoid certain foods because there hasn’t been enough research yet.
You may have read about specific foods being good or bad for people with breast cancer, but these claims often aren’t backed up by scientific evidence. It can be beneficial to eat a varied and nutritious diet, which you’ll find out more about in this booklet.
You can discuss any concerns with your GP or breast care nurse. Or you can ask to be referred to a dietitian (a healthcare professional who assesses and treats dietary and nutritional problems).
Eating healthily is important for everyone, but if you’ve been diagnosed with breast cancer, you may become even more aware of what you eat and drink. A balanced diet can have a range of health benefits.
To eat healthily, try to eat a variety of foods from each of the 4 main food groups every day.
The Eatwell Guide shows the different types of foods you should eat and in what proportions. It recommends you:
Eat at least 5 portions of a variety of fruit and vegetables a day
Eat plenty of starchy foods like potatoes, bread, rice, yams and pasta. They’re a great source of energy and the main source of various important nutrients – choose higher fibre or wholegrain options like brown rice
Have some dairy or dairy alternatives – choose lower-fat and lower-sugar options, and check the label to make sure they have added calcium
Eat some beans, pulses, fish, eggs, meat and other protein – aim for at least 2 portions of fish every week, 1 of which should be oily, such as salmon
or mackerel. Choose lean cuts of meat and mince, and eat less red and processed meat like bacon, ham and sausages
You should also try to:
sunflower oil, and use them in small amounts
water bottle with you during the day can help you stay hydrated
Eating healthily doesn’t mean you can’t have any of the foods or drinks you enjoy that might not be considered healthy, such as those high in fat, salt and sugar. If you follow the Eatwell Guide you can still enjoy these from time to time.
The Mediterranean diet is an example of a diet that contains a balanced mix of different food groups. It’s high in vegetables and fruits, and contains healthy fats such as olive oil.
There are alternative versions of the Eatwell Guide available online for people following vegetarian, vegan, African and Caribbean, and South Asian diets. Find more information on page 23.
Some foods that seem healthy may contain a lot of sugar. For example, dried fruit contains much more sugar than fresh fruit. Alcoholic drinks and some diet foods may also have a high amount of sugar. It’s best to check the labels when considering your sugar intake.
If you’d like to learn more about sugar and diet, see the NHS website nhs.uk
Breast cancer treatments can sometimes affect what you want to eat and drink. Your usual routine may be disrupted, which can affect your eating pattern. Feeling worried or stressed can also affect your appetite, causing you to eat more or less than usual.
Most people feel ready to eat the same day as their surgery or in the days following. You will likely be asked to eat something at the hospital before you go home. Eating well will help your body recover and heal.
It’s hard to tell how your body will react to chemotherapy. You may be able to eat normally throughout your treatment or the side effects may change your eating habits.For more general information about chemotherapy and its side effects, see our Chemotherapy for breast cancer booklet.
Chemotherapy can cause a drop in white blood cells, which can increase your risk of geGing an infection. You’ll have regular blood tests throughout your treatment to check your blood count.
If you’re at an increased risk of infection, you may be given some specific dietary advice to follow. Your chemotherapy team will explain more about this if necessary.
Although there aren’t any particular foods that will boost your white blood cell count, it’s important to follow a healthy diet.
Follow good food hygiene when storing, preparing and cooking food. This is particularly important if you’re at increased risk of infection.
You can find useful information on food safety when your immunity is low by searching for it on the Macmillan Cancer Support website macmillan.org.uk
Your appetite might change during treatment.
If your appetite is small, or taste changes are affecting your diet, eating little and often can be better than having large meals.
It may help to:
bigger meals
For more information about managing weight loss, see page 14.
Some drugs given alongside chemotherapy, such as steroids, can increase your appetite. If you’re worried about gaining weight:
For more information about managing weight gain, see page 12.
You may feel sick or be sick during and after your chemotherapy. Anti-sickness drugs may help – your chemotherapy team can help find one that works for you.
Drink plenty of fluids, such as water or herbal teas. Taking frequent sips is better than trying to drink large amounts in one go. Herbal teas such as mint or ginger can help if you’re feeling sick.
Eating little and often can also help if you’re feeling sick.
Some people find eating cold food makes them feel less sick
because hot food can smell stronger and trigger their nausea.
Chemotherapy can make your mouth sore or dry, making it uncomfortable to eat.
You might find it helpful to:
and floss gently
If you have dentures, clean them regularly and try not to wear them all the time.
Smoking and drinking alcohol can make a sore mouth worse.
Your taste may change during chemotherapy, making foods taste bland or different. You may prefer to eat strongly flavoured foods or use herbs and spices when cooking.
Try a variety of foods to find the ones you like best. As well as going
off your usual foods, you may like foods you previously didn’t like.
Some types of chemotherapy can give you a metallic taste in your mouth. Using reusable plastic or wooden cutlery, instead of metal, can help reduce the metal taste. Using glass pots and pans when cooking can also help.
Eating and drinking less than usual, being less active and taking certain medications can all lead to constipation.
Eating high-fibre foods can help. These include:
Drink plenty of fluids (6 to 8 glasses of water a day) and do
some regular exercise such as walking if you’re able to.
If you’re still having problems with constipation, ask your treatment team or GP for advice. They can prescribe medication to help if necessary.
Occasionally, some chemotherapy drugs can cause diarrhoea. Your GP or treatment team can prescribe medication for diarrhoea if necessary. Drink plenty of fluids to avoid dehydration.
Contact your chemotherapy team if you have 4 or more episodes of diarrhoea in 24 hours.
Some studies suggest short-term fasting around the time of chemotherapy may help reduce side effects. However, more research is needed before any recommendations can be made.
If you’re thinking about fasting, always talk to your treatment
team or GP first.
Having radiotherapy normally doesn’t cause any dietary problems but it’s still good to eat a balanced diet and drink plenty of fluids.
If you’re having radiotherapy around your collarbone or breastbone, you may have a sore throat, dry mouth, difficulty swallowing or indigestion. If this happens, speak to your treatment team. Taking liquid pain relief, such as liquid paracetamol, before eating may help.
If you have to travel for your treatment, take a drink and snack with you and plan meals that are easy to prepare for when you get home. See “Shopping and cooking during treatment” on page 11.
If you’re having hormone therapy, you might find your weight increases. This may be because you’re less active due to fatigue or joint pain, or because of appetite changes. Weight gain is also a common menopausal symptom.
You can find tips for losing weight on page 12.
Hormone therapy drugs such as anastrozole and letrozole can
increase the level of bad cholesterol (LDL) in your blood.
If you have too much bad cholesterol it can build up in your artery walls, leading to artery disease or other health conditions.
Following a healthy diet and maintaining a healthy body weight can help reduce your levels of bad cholesterol.
Your GP can tell you more about how cholesterol levels are measured and what dietary changes you may need to make.
As you go through treatment and recovery, simple tasks like shopping and cooking can feel exhausting.
Try to accept any offers of help, even if you’re used to coping on your own. You can also take advantage of online shopping or ask local shops if they have a telephone ordering and delivery service.
It’s important to have fresh food in your diet, but if you can’t shop regularly, frozen and tinned fruit and vegetables are full of nutrients and can be great alternatives. Choose tinned fruit in juice rather than syrup and tinned vegetables that have less salt.
See our website for more information on coping with fatigue during and after treatment. Macmillan Cancer Support also has an information booklet called Coping with fatigue which you can order on its website macmillan.org.uk
If you’re already following a specific diet because you have
a medical condition – such as diabetes, Crohn’s disease or irritable bowel syndrome (IBS) – having breast cancer doesn’t mean your diet has to change.
If you’re concerned about how your breast cancer treatment may affect your diet or any existing condition, talk to your breast care nurse or treatment team. They can talk to a dietitian or other medical staff to ensure any existing condition remains under control during your treatment.
After treatment for breast cancer, you may have gained or lost weight, or you may want to know if diet can play a role in your recovery and future health.
It can be helpful to speak with your breast care nurse, GP or practice nurse. They can assess if your current weight is healthy and determine your body mass index (BMI). They’ll also discuss your current diet and lifestyle and can help you put a plan together if changes are required.
You tend to put on weight when the amount of calories you eat is more than the amount of calories you burn through everyday activities and exercise.
You may put on weight during and after treatment due to:
If you want to lose weight after treatment, aim for a realistic weight loss of about 0.5 to 1kg (1 to 2 pounds) a week. You can do this by making small changes to your usual eating and exercise habits.
Try to:
free squash for extra flavour
You may find the support from a local weight loss scheme or club helpful. Some pharmacies offer a free weight management service to assess your weight and give you advice and support. Your GP can also recommend and refer you to local support services. They may also refer you to a dietitian.
The NHS has a free 12-week weight loss plan. Your GP can tell you about it or you can download the plan and find out more about weight loss on the NHS website nhs.uk
There are also NHS digital weight management programmes, such as Oviva and Second Nature, available for people living with obesity and diabetes, high blood pressure or both. You can speak to your GP about joining. If you’re not eligible to be referred to these programmes through the NHS, you may have
to pay a monthly fee. But your GP should be able to recommend some free alternatives.
Obesity UK also has UK-based support groups for people living
with obesity. You can find out more at obesityuk.org.uk
You can find more information about physical activity and
breast cancer on our website.
If you’ve lost weight during your treatment, some simple changes to your diet can help.
To put on weight in a healthy way, you need to eat more calories and more protein. Adding an extra 300 to 500 calories a day is a good aim.
You can also try to:
because this might make you feel full
Your GP can prescribe high-protein or high-energy drinks and soups if you need extra help to gain weight, or they may refer you to a dietitian.
Treatments such as chemotherapy or hormone therapy can sometimes affect bone health. This can increase your risk of osteopenia or osteoporosis, conditions that affect the bones.
It’s important to get enough calcium from your diet as calcium is vital for healthy bones.
Good sources of calcium include:
Vitamin D is needed to help your body absorb calcium. The main source of vitamin D is sunlight. You can also get vitamin D from some foods including:
Your GP may recommend a calcium or vitamin D supplement.
If you’re struggling to get essential nutrients or vitamins from your diet during or after treatment, your GP may prescribe a dietary supplement. For example, if your bone health has been affected, they may prescribe a calcium or vitamin D supplement.
However, unless you’re having problems recovering from treatment, you do not need to take supplements.
Some people wonder whether certain supplements, such as vitamins, herbal remedies or probiotics, might help ease their symptoms or treatment side effects. But there’s conflicting evidence about the safety and effectiveness of many products.
Supplements do not have to comply with the same regulations or go through the same rigorous testing as conventional medicines. They may also affect how certain cancer treatments work, such as chemotherapy and radiotherapy.
You can also find information about supplements on the Sloane
Kettering website mskcc.org
You may have heard that diet can affect the risk of breast cancer coming back (recurrence).
The World Cancer Research Fund (WCRF) recommends that people who have had breast cancer follow advice to reduce their risk of cancer coming back. This includes:
You can find out more about exercise and keeping active on
our website.
There is some evidence that fibre may reduce the risk of breast cancer recurrence, but further research is needed to find out more.
High-fibre foods tend to be lower in calories and can help you feel full for longer. Experts think fibre has many health benefits including improving digestive health and helping prevent heart disease and some cancers.
High-fibre foods include:
There is some evidence that saturated fat may increase the risk of
recurrence, but again further research is needed to find out more.
It’s a good idea to limit the amount of fat you eat, particularly saturated fat because it increases the risk of conditions such as heart disease.
Foods high in saturated fat include:
Try to replace these with healthier fats such as:
Soya foods such as soya milk and tofu contain natural compounds called phytoestrogens. Foods like chickpeas and linseeds also contain phytoestrogens.
Phytoestrogens have a chemical structure that is similar to the hormone oestrogen, but their effects are much weaker. As oestrogen can encourage some breast cancers to grow, some people worry whether foods or supplements containing phytoestrogens might have the same effect and increase the
risk of recurrence. But phytoestrogens are not the same thing as female hormones and don’t affect your body in the same way.
Current evidence suggests a diet containing naturally occurring phytoestrogens is safe if you’ve had breast cancer and may be beneficial.
Phytoestrogens are also found in herbal remedies like black cohosh, red clover and sage, which are sometimes taken to relieve hot flushes and other menopausal symptoms. However, these are not recommended because the evidence on their effectiveness and safety is limited and conflicting.
Soya supplements are also not recommended for people with breast cancer as we need more research to determine their safety.
There is no evidence that dairy products increase the risk of breast cancer coming back.
You can eat or drink dairy products like milk, cheese and yoghurt as part of a healthy diet. They’re an important source of protein, calcium and certain vitamins.
Some dairy products are high in fat. Because maintaining a healthy weight can reduce the risk of breast cancer coming back, try to eat higher fat dairy foods like cheddar cheese and double cream in small amounts. You can also opt for lower-fat options like semi-skimmed or skimmed milk or low-fat cheese. Check the labels as some low-fat foods contain a lot of sugar, which can also cause weight gain.
If you prefer to follow a dairy-free diet, try to make sure you’re still eating calcium (see page 15).
There’s no evidence that following a sugar-free diet will reduce your risk of breast cancer recurrence.
You can still eat sugar, but try to have sugary foods and drinks like biscuits, sweets and fizzy drinks in moderation as eating lots of sugar can lead to weight gain. Opt for healthier sweet foods like fruit if you can.
Some people eat organic foods as a way of reducing pesticides in their diet. However, no association has been found between eating an organic diet (before or after diagnosis) and the risk of breast cancer recurrence.
“Superfood” is a marketing term used to describe foods that are apparently beneficial for preventing or treating a range of health conditions. It is not based on scientific evidence. Foods promoted as superfoods include blueberries, raspberries, green tea and broccoli.
There is no evidence that any single food can reduce the risk of breast cancer developing or coming back.
Studies have shown drinking alcohol increases the risk of getting breast cancer. It’s less clear if drinking alcohol affects the outlook (prognosis) of breast cancer.
NICE (National Institute for Health and Care Excellence) recommends that people who’ve had breast cancer limit their alcohol intake to below 5 units a week.
You can find out how many units are in your drinks by using an
online unit calculator. As a general guide:
It’s worth bearing in mind that alcohol is also high in calories.
You can learn more about calculating alcohol units on the NHS website nhs.uk
Some people who have had breast cancer consider following a special diet. They include:
These diets often encourage eating or avoiding certain types of food.
There’s no conclusive evidence that special cancer diets like these reduce the risk of breast cancer recurrence.
Special diets are often very restricting, expensive and can sometimes lead to a lack of nutrients. This may result in other conditions such as anaemia (too few red blood cells in the body), or bone conditions such as osteopenia or osteoporosis (see page 15).
If you’re thinking about changing your diet or want to find out more about different diets, you may find it helpful to talk to your treatment team or a dietitian. You might also want to contact some of the organisations listed at the end of this booklet for more information.
Eating healthily is important for everyone, but if you’re living with secondary breast cancer you may be feeling anxious about what to eat and drink.
If you’re having treatment, you might be experiencing appetite and taste changes, or you might have lost or put on weight.
Research evidence about diet and cancer can be confusing. There’s no scientific evidence that people with secondary breast cancer should follow a special diet, or that a particular diet can make a difference to your outlook (prognosis).
However, a healthy, balanced diet can help give you energy and improve your mood. What this looks like for you will depend on your individual needs.
There are also changes you can make to help you manage symptoms like taste changes, feeling sick and poor appetite. If you need help, you can talk to your treatment team, or ask to speak to a dietitian for specialist advice.You can find more information on our website and in our Secondary breast cancer information pack. You can also talk to our specialist nurses on our free helpline on 0808 800 6000 or at breastcancernow.org
Vegetarian Eatwell Guide The Vegetarian Society vegsoc.org
Vegan Eatwell Guide The Vegan Society vegansociety.com
African and Caribbean Eatwell Guide The Diverse Nutrition Association diversenutritionassociation.com
South Asian Eatwell Guide MyNutriWeb mynutriweb.com
shop.royalmarsden.org
The Royal Marsden Cancer Cookbook contains over 150 healthy and tasty recipes for people with a cancer diagnosis. It contains recipes to cook both during and
aŁer treatment. You can order it from the Royal Marsden’s website and it costs £20
The Life Kitchen cookbook
lifekitchen.co.uk
The Life Kitchen aims to help people affected by cancer enjoy food again by focusing on taste and flavour. You can order their cookbook through the Life Kitchen’s website and it costs £20.
bda.uk.com
Helps you find a dietitian who is appropriately trained and qualified.
nutrition.org.uk Telephone: 020 7557 7930
Provides impartial, evidence-based information on food
and nutrition.
nhs.uk/live-well
Offers tips on eating healthily, losing weight and
physical activity.
Penny Brohn UK pennybrohn.org.uk Helpline: 0303 3000 118
Offers health and wellbeing information and courses for people affected by cancer. They provide practical tips on healthy eating and exercise, and managing uncertainty and anxiety
theros.org.uk
Helpline: 0808 800 0035
Provides a range of booklets and online information about osteoporosis. They also have a helpline staffed by nurses with specialist knowledge of osteoporosis.
wcrf-uk.org/uk
Nutrition and Living with Cancer Helpline: 0333 034 1988 / helpline@wcrf.org
Includes information for people living with and beyond
cancer on reducing the risk of their cancer coming back.
If you have any questions about diet and breast cancer, we’re here for you. You can speak to our specialist nurses on our free helpline 0808 800 6000 or through our website.
Find out more about the support services we offer at
We’re Breast Cancer Now, the research and support charity. However you’re experiencing breast cancer, we’re here.
Whoever you are, and whatever your experience of breast cancer, our free services are here. Whether you’re worried about breast cancer, dealing with a diagnosis, working out life with or beyond treatment – or someone you love is.
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© Breast Cancer Now, August 2024. All rights reserved
BCC98 Edition 8, next planned review August 2026
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