A study of 83,000 people in Japan showed that those who frequently drank green tea or coffee per day had a risk of stroke 20 percent lower. Even the protective effect against certain types of stroke is greater.
"If you can not change your lifestyle, try to prevent stroke by regularly drinking green tea every day," said Dr.Yoshihiro Kokubo of National Cerebral and Cardiovascular Center, Osaka, Japan.
Although it was not clear why coffee and tea had the effect of preventing stroke, but according to Kokubo it may be associated with the ingredients in these drinks that keep blood clots.
In addition, green tea contains catechins, which have antioxidant and anti-inflammatory effects. Some of the substances in coffee, such as chlorogenic acid also reduces the risk of stroke by lowering the risk of diabetes mellitus.
The content of caffeine in coffee also have an effect on cholesterol levels and blood pressure. It also led to changes in insulin sensitivity that affect blood sugar.
Even so, according to Dr.Ralph Sacco, a former American Heart Association priseden, such as the type of research conducted Kokubo can not accurately ascertain whether the reduction in stroke risk was indeed derived from the consumption of coffee and tea.
"The link is visible from such studies are limited in their ability to indicate whether content in coffee, tea, or indeed the lifestyle of the respondents who have a protective effect," says Sacco.