Flavanol-rich cocoa may reduce blood pressure a bit

 Eating a daily dose of cocoa or dark chocolate - rich in plant compounds called flavanols - may lead to a slight drop in blood pressure for a short period of time, a fresh look at past research suggests.

Pulling data from 20 studies published over the last decade, researchers found that people who ate flavanol-rich cocoa products every day for a few weeks saw their blood pressure drop by about two or three points.

That's far less than the reduction people taking blood pressure lowering medication could expect, but it's on par with the effects of adding diet changes or exercise to their routine, according to the researchers.

That doesn't mean people should drop exercise in favor of chocolate, said Dr. Elizabeth Jackson, a cardiologist and assistant professor of medicine at the University of Michigan Health Systems in Ann Arbor.

"If I had to choose between cocoa and exercise, I would take the exercise," said Jackson, who was not involved in the new study.

"To me this says a little bit of dark chocolate isn't too bad, but you wouldn't want to go overboard with the calories and eat a pound of chocolate," she said.

SMALL REDUCTIONS

For the analysis, published in The Cochrane Library, Australian researchers searched several online databases to find randomized controlled trials - considered the "gold standard" of medical research - that compared people eating flavanol-rich cocoa products to people eating low-flavanol cocoa powder or products that contained none of the plant compounds.

While the researchers cannot say flavanols are responsible for lowering blood pressure in the study participants, the compounds - which are also found in foods such as green tea, berries and red wine - are linked to nitric oxide production in the body. Nitric oxide, according to the authors, helps relax blood vessels, which reduces blood pressure.

According to the American Heart Association, a person's systolic blood pressure (the top number) should be less than 120 millimeters of mercury (mm Hg), and their diastolic blood pressure (the bottom number) should be less than 80 mm Hg.

The 20 studies included in the review followed people who were generally healthy for two to 18 weeks.

Of 856 participants, 429 ate between 3 grams (g) and 100 g of dark chocolate or cocoa that contained anywhere from 30 milligrams (mg) to 1080 mg of flavanols, daily.

The other 427 people were put in comparison groups that ate low-flavanol cocoa powder or products that did not contain any flavanols.

At the end of the studies, those who ate the flavanol-rich dark chocolate or cocoa product saw their systolic blood pressure fall by roughly 2.8 mm Hg while their diastolic fell by 2.2 mm Hg.

There are, however, some limitations to the findings.

Read more.. http://www.nlm.nih.gov/medlineplus/news/fullstory_128258.html