The tests also showed that tea drinkers had a lower probability of accumulation of calcium in the coronary arteries. The deposition of calcium in the blood vessels is known to be associated with serious diseases such as heart disease and stroke, experts say. At the moment, scientists can not explain the cause-and-effect relationship between tea drinking and heart disease and plan to carry out further studies. Probably beneficial effects of tea on the heart due to the presence of flavonoids that have antioxidant effect. According to experts, flavonoids prevent cell damage and reduce arterial stiffness.