Dark chocolate can not only soothe your soul but can lower blood pressure too, researchers reported Monday. 　 　The study, published by the American Heart Association, joins a growing body of research that show compounds found in chocolate called flavonoids can help the blood vessels work more smoothly, perhaps reducing the risk of heart disease. 　　                  

              But scientists are far from being able to make specific recommendations for patients based on their research on chocolate, and nutritionists have urged people to be cautious because chocolate is high in fat, sugar and calories.