Advertisement
Stay hydrated, opt for fruits, veggies, whole grains and lean protein — and try to eat snacks and smaller meals throughout your day instead of larger portions
Whether you’re newly diagnosed with breast cancer or you’re facing breast cancer that has spread to another part of your body, you probably have a lot of questions and fears. And you want to do everything in your power to help your body fight back.
Advertisement
Cleveland Clinic is a non-profit academic medical center. Advertising on our site helps support our mission. We do not endorse non-Cleveland Clinic products or services. Policy
A balanced diet helps ensure you’re getting the nutrients you need to keep you strong. But what should that entail? And just as importantly, what foods should you try to avoid?
Registered dietitian Anna Taylor, RD, LD, offers diet tips for undergoing cancer treatment, including what to eat and what to steer clear of.
Breast cancer treatment can have you feeling less than 100%, and your appetite may not be what it usually is. But it’s more important than ever to focus on the foods you’re putting into your body.
“A balanced diet supports a healthy immune system, balanced electrolytes and muscle mass,” Taylor says. “It also gives you energy and helps fight the fatigue that is so often associated with cancer treatment.”
Remember to eat regularly throughout the day, choosing foods from the main food groups: Fruits, vegetables, protein, whole grains, healthy fats, and low-fat dairy.
Taylor suggests eating five to six small meals per day, as they’re less likely to trigger uncomfortable side effects like nausea, vomiting or diarrhea. Small meals also maximize your body’s ability to absorb nutrients.
“Our bodies can only absorb so much at one time,” Taylor notes, “so spreading things out with small frequent meals helps your body get the most out of every meal, which is especially important when you have breast cancer.”
Advertisement
Plus, she says that if you have a poor appetite, a large plate of food can be a total turn-off. A small meal or snack may be more appealing, making you more likely to actually eat it.
So, how can you know how many calories is enough? When you’re undergoing breast cancer treatment, forget food tracking and calorie counting. The best way to know whether you’re getting enough calories for energy is to weigh yourself once or twice a week.
If your weight is trending down week after week, speak with a dietitian to figure out an eating plan that works for you.
Protein, which helps maintain lean body mass and muscle, is primarily found in:
Smaller amounts of proteins are found in vegetables and whole grains.
Trying to figure out how much protein you need? It depends on a lot of different factors, including age, weight, height and activity level.
“Everyone’s protein needs are different, but fighting cancer and going through cancer treatment increases your protein needs,” Taylor explains. “A good rule of thumb is to include protein at least three to four times per day if you’re eating normal portions of foods, or at least four to five times per day if you’re eating smaller-than-usual portions of foods.”
Examples include eggs with breakfast, Greek yogurt with lunch, chicken with dinner and cottage cheese or nuts as a snack.
Staying hydrated is always important, but it’s especially during breast cancer treatment. Some common side effects of cancer treatment can include vomiting, diarrhea, decreased appetite or fever, all of which can contribute to dehydration.
“If you’re vomiting or having diarrhea, an electrolyte replacement solution is a better way to hydrate than plain water,” Taylor says. “Otherwise, plain water is a great option.”
To keep hydrated, aim for at least 2 liters to 3 liters of fluid per day, or about 66 ounces to 99 ounces. Plain water is your best option, but other caffeine-free fluids can be a good choice, too.
“Your fluid needs are typically higher while going through cancer treatment, so sip fluids throughout the day,” she advises. “Staying hydrated will help you regulate your body’s temperature, blood pressure and electrolyte balance, help prevent or minimize constipation and allow your organs to filter out wastes and toxins.”
When you’re facing breast cancer, you might feel tempted to bone up on vitamins and minerals via supplements. Instead, eat the rainbow — a rainbow of brightly colored produce, that is.
Advertisement
“No supplement can do the work of a varied diet, so don’t turn to pills to do it for you,” Taylor states. “Plant-based foods like fruits, vegetables, beans, grains, nuts and seeds are filled with phytonutrients, which are naturally occurring chemicals that support human health.
There are different types of phytonutrients, like carotenoids and flavonoids, and they do different things for your body. But what’s the rainbow got to do with it?
“Phytonutrients are largely what give produce its color,” Taylor explains, “so the more vibrant the color, the more likely it is to be filled to the gills with phytonutrients.” (There are exceptions, of course, like cauliflower and kohlrabi — bland-looking foods are still big on nutrients. Don’t count them out!)
Here’s a look at some common foods that contain important phytochemicals:
Phytochemical | Food Source |
---|---|
Carotenoids | Dark yellow/orange/green vegetables and fruits. |
Isothiocyanates | Mustard, horseradish and cruciferous vegetables. |
Phenolic compounds | Garlic, green tea, soybeans, cereal grains, cruciferous vegetables and flaxseed. |
Flavanoids | Most fruits and vegetables. |
Organo-sulfides | Garlic, onion, leeks, shallots and cuciferous vegetables. |
Isoflavones | Soybeans, legumes and flaxseed. |
Indoles | Cruciferous vegetables (broccoli, cauliflower, kale, cabbage, Brussels sprouts). |
Phytochemical | |
Carotenoids | |
Food Source | |
Dark yellow/orange/green vegetables and fruits. | |
Isothiocyanates | |
Food Source | |
Mustard, horseradish and cruciferous vegetables. | |
Phenolic compounds | |
Food Source | |
Garlic, green tea, soybeans, cereal grains, cruciferous vegetables and flaxseed. | |
Flavanoids | |
Food Source | |
Most fruits and vegetables. | |
Organo-sulfides | |
Food Source | |
Garlic, onion, leeks, shallots and cuciferous vegetables. | |
Isoflavones | |
Food Source | |
Soybeans, legumes and flaxseed. | |
Indoles | |
Food Source | |
Cruciferous vegetables (broccoli, cauliflower, kale, cabbage, Brussels sprouts). | |
Food Source | |
If your cancer treatment hasn’t caused any nutrition-related side effects that limit your ability to eat or digest food, Taylor says you can follow a generally healthy diet. Here’s what that should include.
Aim for five or more servings of fruits and vegetables each day. They contain antioxidants and anti-estrogen properties.
Cruciferous vegetables like broccoli, cauliflower, kale, cabbage and Brussels sprouts are rich in phytochemicals and especially good to include in your diet.
Advertisement
“Try to include a serving of produce with every meal and snack,” Taylor recommends. “At three meals and two snacks per day, for example, you’d get a total of five servings per day.”
Try to get 25 grams to 30 grams of fiber, like by eating whole grains — unprocessed foods that are high in complex carbohydrates, fiber and phytochemicals, as well as vitamins and minerals.
A study by researchers at Soochow University in Suzhou, China, found that high fiber intake may have a positive effect by altering the hormonal actions of breast cancer and other hormone-dependent cancers.
Make sure at least half the grains in your diet are whole grains like oats with breakfast, whole grain bread with lunch or brown rice with dinner.
“Another way to add fiber and complex carbohydrates is to choose nuts or seeds as a snack,” Taylor says. “You can also add legumes like beans, edamame, peas or lentils to meals.”
For good protein sources, increase your intake of poultry, fish and legumes like beans and lentils; minimize your intake of processed meats, like those that are cured, pickled and smoked.
A regular intake of processed meats is associated with an increased risk for certain types of cancer. Processed meats are also high in sodium, which can elevate your blood pressure in the short term.
Advertisement
Feeling skeptical of soy? Soy is safe in moderate amounts, which means you can eat one to two servings per day of whole soy foods (like tofu, edamame and soy milk).
If you’re experiencing unpleasant side effects while you undergo breast cancer treatment, what you eat (and avoid) may be able to help lessen your symptoms. Here’s what may help.
If you’re having diarrhea, you may need to follow a low-fiber diet until it resolves. Make some temporary swaps, like:
Taylor recommends eating small, frequent meals, which are often better tolerated than large meals. And, again, be sure to stay hydrated by sipping on water or an electrolyte replacement solution to replenish the fluids and electrolytes that your body is losing.
“Sip on fluids throughout the day rather than drinking large quantities all at once with meals,” she advises, “and talk to your healthcare provider to see if an antidiarrheal medication is appropriate.”
“An empty stomach can make nausea worse, so don’t skip meals entirely,” Taylor says. “Instead, focus on small bites of food throughout the day.” Your dietitian may also recommend that you:
If constipation becomes a problem, Taylor says your dietitian may advise you to do the following actions to encourage regular bowel movements:
People often experience more fatigue when they’re not eating well or when they’re losing weight during treatment. To combat fatigue, choose high-protein snacks and small frequent meals, rather than large meals.
You’re focusing on all the things you should eat, but it’s also important to know what foods you should avoid. Talk to your oncologist for exact recommendations, but for the most part, when you have breast cancer, you should avoid:
“Limit caffeine and alcohol, as both are dehydrating,” Taylor advises. “If you’re having diarrhea, consider avoiding them completely, as both can worsen symptoms.”
In fact, it’s best to avoid alcoholic beverages when possible, as it’s a known risk factor for breast cancer. A large observational study of 105,986 women suggested that drinking three glasses of wine or more per week throughout life increases a woman’s risk of breast cancer by a small but significant percentage.
The study saw a 15% increased risk of breast cancer when women drank an average of three to six drinks per week, compared to women who did not drink.
“Some studies tout possible benefits for heart health from moderate intake of red wine, but regardless of the type of alcohol, daily intake is associated with an increased risk of certain cancers, including breast cancer,” Taylor adds.
“If you’re experiencing any side effect that affects your ability to eat regularly, ask your care team if you can meet with a dietitian to review individualized nutrition recommendations,” Taylor says.
Even if you’re not experiencing specific side effects related to food and eating, you may find it helpful to meet with a dietitian, especially one who specializes in cancer care.
“A dietitian can help you be sure you’re getting enough of the nutrients you need to help your body stay strong as you go through breast cancer treatment,” Taylor encourages. “We’re here to be another resource to you during a difficult time.”
Learn more about our editorial process.
Advertisement
Give these 30+ grocery items a try to help find relief
When you’re living with cancer, eating enough protein and a variety of colorful foods can help you keep up your strength and energy
This Mediterranean puree may bolster your heart health, digestive function and blood sugar management
One of the best things you can do if you have FA is follow a balanced diet of fruits, vegetables, whole grains and lean proteins
Artificial intelligence and machine learning are being integrated into chatbots, patient rooms, diagnostic testing, research studies and more — all to improve innovation, discovery and patient care
Catechins (antioxidants) in green tea help fight inflammation and diabetes, while improving memory and heart health
It’s a type of intermittent fasting that restricts calories two days per week
This quirky food trend is harmless, as long as you’re getting enough protein, fiber and healthy fats
Focus on your body’s metabolic set point by eating healthy foods, making exercise a part of your routine and reducing stress
PFAS chemicals may make life easier — but they aren’t always so easy on the human body
While there’s little risk in trying this hair care treatment, there isn’t much science to back up the claims