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Heart Disease


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Health Discovery

Go Over to the Dark Side. Of Chocolate, That Is

Weekly chocolate consumption helps heart

En español | If a little is good, then a lot is … worse?

That is the less-is-more conclusion of a new study of older Swedish women that found that eating high-quality chocolate once or twice a week is good for the heart, but eating it too much is not. The study is highly relevant as nearly 6 million Americans have heart failure and one in four women will die from heart disease, according to the National Institutes of Health.

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The nine-year study of women ages 48 to 83 found that those who ate a small amount of Swedish chocolate once or twice a week had a one-third lower risk of developing heart failure. Those who ate it daily received no protective benefit. Women who ate chocolate a couple of times a month also showed some benefit, but not as much as the weekly group.

Also significant was the quality of chocolate the women consumed, which had a higher amount of cocoa solids than the average American chocolate. Swedish milk chocolate contains 30 percent cocoa solids, while dark chocolate contains 35 percent. By comparison, U.S. standards for dark chocolate require only 15 percent cocoa solids—half that of Swedish milk chocolate.

That doesn't mean American women need to eat twice as much dark chocolate to protect their hearts, cautions Linda Van Horn, professor of preventive medicine at Northwestern University's Feinberg School of Medicine. "Chocolate is not magical and does not work in isolation," she says. A diet that is high in fiber, fruits and vegetables, fish "and a little chocolate," she adds, is best for avoiding weight gain and preventing heart disease.

The study, published online this month in the journal Circulation: Heart Failure, was conducted by researchers from Harvard University and Sweden's Institute of Environmental Medicine. They looked at the heart failure rates of nearly 32,000 women who had filled out food consumption questionnaires as part of a Swedish mammography study.

Next: Why bitter is best. >>

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