Could Soy Help Lower Your Blood Pressure?

SUNDAY, March 25 (HealthDay News) — Isoflavones — a compound
found in foods such as soy milk, green tea, tofu and peanuts — may help
lower blood pressure in young adults, new research suggests.

The researchers also found that isoflavones may be of particular
benefit for black American adults, nearly 42 percent of whom are estimated
to have high blood pressure, also known as hypertension.

One expert not connected to the study said there is reason to believe
that isoflavones could help the heart.

Isoflavones “dilate the vessels by increasing the release of nitric
oxide,” explained Dr. Suzanne Steinbaum, director of women and heart
disease at Lenox Hill Hospital in New York City. She said the new study,
“brings to light a compelling dietary recommendation that can help control
hypertension in younger patients.”

In the new study, investigators examined data from more than 5,000
participants in a major study funded by the U.S. National Institutes of
Health.

The analysis revealed that those who consumed the highest amounts of
isoflavones per day (more than 2.5 milligrams [mg]) had an average 5.5
mmHg lower systolic pressure (the top number in a blood pressure reading)
than those who consumed less than 0.33 mg of isoflavones per day.

To understand what that means to the everyday diet, an 8-ounce glass of
soy milk has about 22 mg of isoflavones and 100 grams of roasted soybeans
have as much as 130 mg of isoflavones, the researchers explained.

The study was to be presented Sunday at the annual meeting of the
American College of Cardiology (ACC) in Chicago.

“What’s unique about this study is that the results are very applicable
to the general population. Our results strongly suggest a blood pressure
benefit for moderate amounts of dietary isoflavone intake in young black
and white adults,” lead investigator Safiya Richardson, a graduating
medical student at Columbia University’s College of Physicians and
Surgeons in New York City, said in an ACC news release.

“Our study is the first to show a benefit in African-Americans, who
have a higher incidence of high blood pressure, with an earlier onset and
more severe end-organ damage,” she added.

The findings “could mean that consuming soy protein, for example, in
combination with a DASH diet — one that is high in fruits and vegetables,
low-fat dairy and whole grains — could lead to as much as a 10 mmHg drop
in systolic blood pressure for pre-hypertensives [people on the threshold
of high blood pressure], greatly improving their chances of not
progressing to hypertension,” Richardson said.

“Any dietary or lifestyle modification people can easily make that
doesn’t require a daily medication is exciting, especially considering
recent figures estimating that only about one-third of American
hypertensives have their blood pressure under control,” she added.

It’s believed that isoflavones boost the body’s production of enzymes
that create nitric oxide, which helps to widen blood vessels and thereby
reduce blood pressure.

Findings presented at medical meetings are typically considered
preliminary until published in a peer-reviewed journal.

More information

The American Heart Association has more about the prevention and treatment of high blood pressure.

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