Monday, February 1, 2010

Tofu, Soy Diet Linked to Lower Death in Breast Cancer

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Tofu, Soy Diet Linked to Lower Death in Breast Cancer

Survivors

By Nicole Ostrow

Dec. 8 (Bloomberg) — Breast cancer survivors in China who

ate tofu, soy milk and fresh beans as part of a diet rich

in soy protein had a lower risk of dying and less chance

their cancer would return, a study found.

Those who ate the most soy protein had a 29 percent lower

risk of dying and a 32 percent lower rate of their breast

cancer returning than those who had the lowest intake of

soy, research showed today in the Journal of the American

Medical Association. The foods included in the study were

tofu, soy milk and fresh soy beans, all common choices in

Asian meals.

The study, which followed women for an average of about

four years, is the largest to examine the influence of soy

intake on breast cancer survival and recurrence, the authors

said. More than 192,000 women in the U.S. will be diagnosed

with breast cancer this year, according to the National

Cancer Institute.

“Women with breast cancer can be assured that consumption of

moderate amounts of soy food is safe and may be associated

with better outcomes,” said the study’s lead author Xiao-Ou

Shu, a professor of medicine at Vanderbilt University in

Nashville, Tennessee, in a Dec. 4 e-mail. The researchers

will follow the women to watch “the long-term effects of soy

food intake on health among breast cancer survivors,

including bone density, fracture and coronary heart disease,”

she said.

Rich in Isoflavones

Soy foods are rich in isoflavones, which are estrogen-like

compounds that occur naturally in plant foods. Soy isoflavones

may compete with the body’s estrogen in binding to cell

receptors, reducing the amount of estrogen in the body and

hindering the ability of cancers to grow. The most common

types of breast cancer depend on estrogen to grow, Shu said.

The researchers said the results eased previous concern that

isoflavones might interfere with tamoxifen, a cancer drug

designed to block estrogen. The study found higher soy food

consumption was beneficial regardless of whether a patient

was taking tamoxifen, she said.

The researchers analyzed data from women in the Shanghai

Breast Cancer Survival Study in China. The women had been

diagnosed with breast cancer from March 2002 to April 2006.

They were followed for an average of four years through June

2009.

At that time, there were 444 total deaths and 534 breast

cancer recurrences or breast cancer-related deaths among

5,033 women in the study.

Death Rate Lower

The four-year mortality rate was 7.4 percent for women with

the highest consumption of soy protein compared with 10.3

percent for those with the lowest intake. The four-year

breast cancer recurrence rates were 8 percent for those in

the highest soy group and 11.2 percent for those in the

lowest group, the researchers found.

Eating soy food that is the equivalent to 11 grams

(0.39 ounces) of soy protein or 40 milligrams of soy

isoflavone a day was enough to see a benefit, Shu said.

In the study, the women consumed an average of 47

milligrams a day of isoflavone compared with the average

U.S. intake of 1 milligram to 6 milligrams a day, the

researchers said.

The U.S. Food and Drug Administration recommends people

consume 25 grams of soy protein a day, which contains

about 50 milligrams of isoflavone, as part of a diet low

in saturated fat and cholesterol that may help reduce the

risk of heart disease. One cup of fortified soy milk

contains 10 grams of soy protein, or 43 milligrams of

isoflavone, while a half cup of a firm soybean patty

called tempeh contains 16 grams, or 53 milligrams of

isoflavone. A half-cup of tofu or about 1.5 cups of edamame,

a green vegetable, also each contain 10 grams of soy protein.

Survival Benefits

Other ingredients in soy foods including folate, protein,

calcium or fiber may also be responsible for the survival

benefits, Shu said.

More soy foods are consumed in China than in the U.S.,

according to an editorial written in the same journal by

Rachel Ballard-Barbash at the National Cancer Institute

in Bethesda, Maryland, and Marian Neuhouser at the Fred

Hutchinson Cancer Research Center in Seattle.

Ballard-Barbash and Neuhouser said most soy in the U.S.

is consumed through supplements and processed foods,

including meat substitutes made with soy, that may contain

lower amounts of isoflavones. Future studies should look at

whether isoflavone supplements have similar results as those

seen with soy food, Shu said.

More studies are needed in larger numbers of people among

more diverse populations to fully understand the effects of

soy on breast cancer survivors, Ballard-Barbash and Neuhouser

wrote.

“In the meantime, clinicians can advise their patients with

breast cancer that soy foods are safe to eat and that these

foods may offer some protective benefit for long-term health,”

they wrote. “Patients with breast cancer can be assured that

enjoying a soy latte or indulging in a pad thai with tofu

causes no harm and, when consumed in plentiful amounts, may

reduce risk of disease recurrence.”

To contact the reporter on this story: Nicole Ostrow in New

York at nostrow1@bloomberg.net.

I hope this article is informative so it can help you to make

the right decisions about your health.

With my unconditional love,

Lea Yekutiel

www.ilovemybreastcancer.com

www.blogtalkradio.com/lea-yekutiel

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