Numerous studies have shown that cocoa has a protective effect against cardiovascular diseases. The reason for this has now been uncovered by researchers at Linköping University in Sweden. When a group of volunteers devoured a good-sized piece of dark chocolate, it inhibited an enzyme in their bodies that is known to raise blood pressure.
“We have previously shown that green tea inhibits the enzyme ACE, which is involved in the body’s fluid balance and blood pressure regulation. Now we wanted to study the effect of cocoa, since the active substances catechins and procyanidines are related,” says study leader Ingrid Persson.
The researchers recruited 16 healthy volunteer subjects for the study. They were not tobacco users and were not allowed to take any pharmaceuticals for two weeks. During the last two days they were not allowed to eat chocolate or anything containing similar compounds, including many kinds of berries and fruits, nor could they drink coffee, tea, or wine.
When the study took place, everyone in the group – ten men and six women between the ages of 20 and 45 – ate 75 grams of unsweetened chocolate with a cocoa content of 72 percent. To analyze what happened with the ACE enzyme, blood samples were taken in advance and then a half hour, one hour, and three hours afterward.
In the sample taken three hours afterward, there was a significant inhibition of ACE activity. The average was 18 percent lower activity than before the dose of cocoa, fully comparable to the effect of drugs that inhibit ACE and are used as a first-choice treatment for high blood pressure.
When the activities of the enzyme decline, the blood pressure goes down with time. As expected, no such effect was found in the subjects. To show this, the study would have to continue over a longer period.
“Our findings indicate that changes in lifestyle with the help of foods that contain large concentrations of catechins and procyaninides prevent cardiovascular diseases,” she says
- Why chocolate protects against heart disease (sciencedaily.com)
- Love Chocolate? So Does Your Heart (webmd.com)
- In Cocoa Land (foxnews.com)
- Dark Chocolate Benefits (suite101.com)
- Chocolate Eaters May Have Healthier Hearts (nlm.nih.gov)
- Dark Chocolate: Good for the Heart (healthfieldmedicare.suite101.com)
- 10-Year Study: Women Who Eat Chocolate Have Healthier Hearts (aolhealth.com)
- Sweet Thoughts (psychologytoday.com)
- iamdwightakasuperman: CRAVING eating chocolate does not… (gwendolen.tumblr.com)