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Why Less Breast Cancer in Asia?

Though breast cancer is the most common cancer among women around the world, the rate in some areas of the world, such as Asia, is up to six-fold lower than in North America. Maybe it’s the green tea and soy?

As I show in my 3-min. video Why Do Asian Women Have Less Breast Cancer?, if anything, green tea may only drop risk by about a third. Soy works better, but only, it appears, if you start young. Soy intake throughout the lifecycle is associated with decreased breast cancer risk, but the strongest, most consistent effect is for childhood intake, cutting the risk of later breast cancer by as much as half. If you don’t start consuming soy until your teens or adulthood, though, then soy is only associated with about a 25% drop in breast cancer risk.

Combined, green tea and soy consumption would only account for maybe for a two-fold difference in breast cancer risk—not 6-fold, so researchers looked into what else Asian women were eating. In my last Care2 post Mushrooms For Breast Cancer Prevention I presented evidence that plain, cheap, widely available white mushrooms appear able to outsmart breast cancer cells that try to make their own estrogen. That was based on placental tissue samples, though. Click on the video pick above to see mushrooms stacked up against the real thing.

Given the intriguing mushroom experiments, researchers asked a thousand breast cancer patients how many mushrooms they ate. Then they asked the same question to a thousand healthy women who they tried to match to the cancer patients as closely as possible—same age, height, weight, exercise, smoking status, etc. Based on those answers they calculated that women who averaged at least a certain daily serving size of mushrooms appeared to drop their odds of getting breast cancer 64%! What was that average serving size? Half of a mushroom a day.

Who eats half a mushroom? Well, that was averaged over a month. So compared to women who didn’t regularly eat any mushrooms, those who ate just 15 a month appeared to dramatically lower their risk of breast cancer. Similar protection was found for dried mushrooms.

Combining mushroom consumption with green tea—sipping a half teabag’s worth of green tea every day along with eating that half a mushroom—was associated with nearly a 90% drop in breast cancer odds.

Green tea may also help account for the Asian Paradox. Which type is best? See Antimutagenic Activity of Green Versus White Tea. And what may be the best way to prepare it? See Cold Steeping Green Tea. I have another video on Breast Cancer Survival and Soy, though it may be possible to overdo it.

In health,
Michael Greger, M.D.

PS: If you haven’t yet, you can subscribe to my videos for free by clicking here and watch my full 2012 year-in-review presentation Uprooting the Leading Causes of Death.

Image credit: Nomadic Lass / Flickr

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Read more: Cancer, Diet & Nutrition, Eating for Health, General Health, Health, Videos, Women's Health, ,

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Dr. Michael Greger

A founding member of the American College of Lifestyle Medicine, Michael Greger, M.D., is a physician, author, and internationally recognized speaker on nutrition, food safety, and public health issues. Currently Dr. Greger serves as the Director of Public Health and Animal Agriculture at The Humane Society of the United States. Hundreds of his nutrition videos are freely available at


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11:09PM PST on Feb 18, 2015

I’m eager to find the valuable information and for me this is the right place to get the good stuff. Implants Chicago

3:22PM PST on Feb 16, 2014

The China Project in recent years concluded it was because of low dairy intake. There was a series of lectures called 'white lies' - the white lie being that milk is good for you.

1:31PM PST on Feb 16, 2014


2:46PM PST on Feb 15, 2014

This is nonsense. Unfermented soy is the last thing you want to consume if you want to protect your health, especially if it has to do with anything related to hormones. More proof that Gergen doesn't have a clue what he's talking about. The way he can spin and distort study results to fit his vegan agenda is amazing, but not scientific. His hypothesis says nothing about the fact that the "Asian" diet contains a ton more seafood than the western diet.

1:24PM PST on Feb 15, 2014


5:11PM PST on Mar 1, 2013


4:17AM PST on Feb 14, 2013

thank you

8:32PM PST on Feb 12, 2013


7:26PM PST on Feb 1, 2013


9:40PM PST on Jan 29, 2013

genetics might be part of it

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