According to an analysis of research in the Archives of Internal Medicine, published by the American Medical Association, for study participants who consumed cocoa products for at least two weeks, the drop in blood pressure was similar to the drop resulting from prescription blood pressure medication. On the other hand, drinking green and black tea did not seem to lower blood pressure. The benefit from cocoa may cut strokes and heart attacks by 10-20 percent.
Researchers urged caution, however, since cocoa is a high-fat, high-caffeine product that may adversely affect health. It may be added to a diet in small quanities and in place of other high-calorie desserts.
Source: Reuters News Tue Apr 10, 2007