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The Big Picture

What you eat affects your weight, and obesity raises your odds for breast cancer. If you’ve already had the disease, extra pounds can also make it more likely to return. If you choose a healthy diet -- one rich in vegetables, whole grains, chicken, and fish -- you may boost your chances of living longer after breast cancer. Researchers aren’t sure exactly why that’s true, but the long-term benefits aren’t in doubt.

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Is Soy Safe?

Soy-based foods -- such as tofu, soy milk, and edamame -- have chemicals called phytoestrogens, which are similar to estrogen. That once raised fears that they spelled trouble for women with breast cancer that uses estrogen as fuel to grow. But the latest studies show soy doesn’t raise cancer risk -- it may even lower the odds the disease will return. Be wary of soy supplements, though. Scientists haven’t studied their effects as much.

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Should You Skip Sugar?

The idea that sweets “feed cancer” has been around for a long time. The truth is more complicated. A spoonful to take the edge off your coffee will not directly make cancer cells grow faster. But it’s still wise to keep an eye on how much you add to your diet. A lot of sugar on a regular basis can lead to obesity and other conditions that make cancer more likely.

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Eat More Produce

If you eat more plant-based foods, you may lower your chances of getting breast cancer.  Researchers say this strategy especially may help protect against the most aggressive types of tumors. Fruits and vegetables are also an important part of a diet that will help you control your weight, which is key for keeping breast cancer from coming back.

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Embrace Whole Grains

When you add unprocessed wheat, rye, oats, corn, bulgur, rice, and barley to your diet, you may be less likely to get breast cancer. These foods have nutrients called phytochemicals that may lower the chances it will return, too. They can also help protect against cardiovascular disease -- and survivors have higher odds, in part because some treatments can damage the heart.

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Is Alcohol Off-Limits?

The link between booze and breast cancer is murky. Beer, wine, and liquor boost estrogen in the body, which raises concerns about tumors that are sensitive to that hormone. Some studies say that survivors who have more than one or two drinks a week are more likely to have cancer come back, while other research says moderate drinking may be good for you. The effects may be fairly small either way, so an occasional glass is not an issue.

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Is Organic Better?

These foods are grown without pesticides or weedkillers. One highly publicized French study found a link between these products and a lower cancer risk. But the issue is far from settled. The most important thing, scientists agree, is to eat plenty of fruits and vegetables and to wash them carefully to remove the residue of any chemicals.

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Facts About Fat

Some studies say it may play a role in the growth of breast tumors, but the research is far from clear. Your best bet is to limit saturated fats and trans fats -- which come in foods like beef, butter, cheese, ice cream, fried foods, and commercial baked goods. When it comes to protein, go for lean kinds, such as fish and chicken.

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Focus on Fiber

You’ll get this naturally if you eat plenty of whole grains, fruits, vegetables, and legumes. It’s good for your overall health, especially your blood sugar levels, heart, and digestive tract. Some studies have suggested this type of diet can lower your odds of breast cancer. In particular, it may help protect against an aggressive type of tumor.

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Vitamin D

Studies show a link between low levels of this nutrient and higher chances of breast cancer. It may also play a role in the growth of tumors. Add it to your diet with salmon, oysters, herring, mackerel, and sardines. You can also look for milk, yogurt, and orange juice that have it added in.

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Flavonoids

These chemicals, which you find in certain plants, are linked to lower breast cancer odds. The evidence is strongest for two specific types, flavonols and flavones, especially for women who are past menopause. You can find flavonols in onions, broccoli, and tea. Flavones come in parsley, celery, and drinks with chamomile.

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Carotenoids

This is another type of phytochemical in plant-based food linked to lower breast cancer risk. You can get it from orange, yellow, and dark green vegetables and fruits. Look to include more carrots, pumpkins, winter squash, spinach, kale, sweet potatoes, and cantaloupe in your diet.

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Phenolic Compounds

Studies show these types of chemicals may lower your chances of breast cancer and in some cases slow tumor growth. Add more to your diet in the form of garlic, green tea, soybeans, and flaxseed. Fruits and vegetables that have them include broccoli, cabbage, tomato, eggplant, cucumber, and watermelon.

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Supplements to Avoid

You may be interested in natural remedies that claim to treat breast cancer and other health problems. But some have plant compounds you should avoid if you’ve had breast cancer. They include red clover, black cohosh, chasteberry, dong quai, evening primrose, and licorice.

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Sources | Medically Reviewed on 01/31/2019 Reviewed by Jennifer Robinson, MD on January 31, 2019

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SOURCES:

American Cancer Society: “Can I Lower My Risk of Breast Cancer Progressing or Coming Back?” “How Your Diet May Affect Your Risk of Breast Cancer.”

National Cancer Institute: “Obesity and Cancer.”

Oncology Nutrition: “Soy and Breast Cancer.”

Memorial Sloan Kettering Cancer Center: “Nutrition and Breast Cancer: Making Healthy Diet Decisions.”

International Journal of Cancer: “Fruit and vegetable consumption and breast cancer incidence: Repeated measures over 30 years of follow-up.”

Johns Hopkins Medicine: “Nutrition for Breast Cancer Patients and Survivors.”

American Institute for Cancer Research: “Anti-Inflammatory Diet Lowers Breast Cancer Survivors’ Risk of Heart Disease Mortality.”

Oncology Nutrition: “Alcohol and Breast Cancer.”

JAMA Internal Medicine: “Association of Frequency of Organic Food Consumption With Cancer Risk: Findings From the NutriNet-Sante Prospective Cohort Study.”

MD Anderson Cancer Center: “Organic Foods: A Healthier Option to Avoid Cancer?”

Cancer Medicine: “Intake of bean fiber, beans, and grains and reduced risk of hormone receptor-negative breast cancer: the San Francisco Bay Area Breast Cancer Study.”

Breastcancer.org: “Low Vitamin D Levels.”

PLoS One: “Flavonoids, Flavonoid Subclasses and Breast Cancer Risk: A Meta-Analysis of Epidemiologic Studies.”

Breast Cancer Research and Treatment: “Carotenoids and breast cancer risk: a meta-analysis and meta-regression.”

Linus Pauling Institute Micronutrient Information Center: “Carotenoids.”

Anti-Cancer Agents in Medicinal Chemistry: “The Role of Phenolic Compounds in the Fight against Cancer -- A Review.”

Reviewed by Jennifer Robinson, MD on January 31, 2019

This tool does not provide medical advice. See additional information.

THIS TOOL DOES NOT PROVIDE MEDICAL ADVICE. It is intended for general informational purposes only and does not address individual circumstances. It is not a substitute for professional medical advice, diagnosis or treatment and should not be relied on to make decisions about your health. Never ignore professional medical advice in seeking treatment because of something you have read on the WebMD Site. If you think you may have a medical emergency, immediately call your doctor or dial 911.