A study, published by the American Heart Association, revealed that flavonoids, compounds found in chocolate, could help the blood vessels work more smoothly, perhaps reducing the risk of heart disease. Flavonoids are natural antioxidants found in chocolate, tea, red wine, and many fruits and vegetables.
Researcher Jeffrey Blumberg, of Tufts University, in Boston, said: "This study . . . suggests that cocoa flavonoids appear to have benefits on vascular function and glucose sensitivity."

Eating dark chocolate also seemed to improve how the body used insulin, and reduced low-density lipoprotein (LDL), or "bad" cholesterol, by about 10% on average.

However, much research still needs to be done, and nutritionists have urged people to be cautious, because chocolate is high in fat, sugar and calories.