(Ivanhoe Newswire) – New research has indicated that consuming flavonoids – a class of compounds found in fruits, vegetables, dark chocolate and red wine— may indeed lower the risk of stroke in women.
"Studies have shown higher fruit, vegetable and specifically vitamin C intake is associated with reduced stroke risk," Aedín Cassidy, Ph.D., the study's lead author and professor of nutrition at Norwich Medical School in the University of East Anglia in Norwich, United Kingdom, was quoted as saying.
"Flavonoids are thought to provide some of that protection through several mechanisms, including improved blood vessel function and an anti-inflammatory effect."
Cassidy and colleagues used 14-years of follow-up data from the Nurse's Health Study, which included 69,622 women who reported their food intake, including details on fruit and vegetable consumption every four years. Researchers examined the relationship of the six main subclasses of flavonoids commonly consumed in the U.S. diet: flavanones, anthocyanins, flavan-3-ols, flavonoid polymers, flavonols and flavones with risk of ischemic, hemorrhagic and total stroke.
As expected, the researchers didn't find a beneficial association between total flavonoid consumption and stroke risk, as the biological activity of the sub-classes differ. However, they found that women who ate high amounts of flavanones in citrus had a 19 percent lower risk of blood clot-related (ischemic) stroke than women who consumed the least amounts.
In the study, flavanones came primarily from oranges and orange juice (82 percent) and grapefruit and grapefruit juice (14 percent). However, researchers recommended that consumers increase their citrus fruit intake, rather than juice, due to the high sugar content of commercial fruit juices.
More studies are needed to confirm the association between flavanone consumption and stroke risk, and to gain a better understanding about why the association occurs, the authors said.
SOURCE: American Heart Association, February 2012