The American Heart Association (AHA) published on the website "Stroke" the results of a study by the Swedish Karolinska Institute. They show that if no study has ever proven the harmful effects of coffee, however it is proven that women who consume one cup per day are decrease from 22 to 25% their risk of being victims of Stroke.
The study involved 34,670 Swedish women aged 49-83 years, followed for ten years. The researchers took into account the risk factors for stroke, including smoking, weight, hypertension and diabetes. In 1680 stroke, 205 were reported among women who consumed less than a cup of coffee per day.
As tempers Dr. Hayes, one must remain cautious because there is no evidence that coffee reduces the risk of stroke, but that coffee drinkers have a lower risk. Indeed, other factors are taken into account (hypertension, smoking, diabetes). The study author Susanna Larsson, indicates that the mechanism of this effect is not yet known.
It may be that coffee reduces the risk of inflammation or improves insulin sensitivity, or it has an antioxidant effect. New research, however, must be conducted to validate this hypothesis.