Green tea protects against heart disease -- study*

02 Jul 2008 16:10:13 GMT
Source: Reuters
By Michael Kahn

LONDON, July 2 (Reuters) - A few cups of green tea each day may help
prevent heart disease, Greek researchers said on Wednesday.

A study published in the European Journal of Cardiovascular Prevention
and Rehabilitation showed further evidence of the potential health
benefits from a brew already linked to a reduced risk of a range of
cancers and other conditions.

The study showed that green tea improves blood flow and the ability of
arteries to relax, said Charalambos Vlachopoulos, a cardiologist at the
Athens Medical School in Greece who worked on the study.

Other studies have shown that black tea also has benefits for
cardiovascular health.

The Greek team said they believed green tea might be even better because
it had higher quantities of beneficial compounds called flavonoids --
some of which are lost in the oxidation process that black tea undergoes.

Flavonoids are also found in cocoa, tomatoes and grapes.

"A couple of cups a day would probably be a good dose for people,"
Vlachopoulos said. "This is the first study to show these effects for
green tea."

The researchers gave 14 healthy volunteers either green tea, diluted
caffeine or hot water on three separate occasions and then measured the
function of endothelial cells lining the circulatory system.

These cells help relax arteries and ease blood flow.

"What is important is these effects are evident fairly rapidly, within
30 minutes," Vlachopoulos said.

The measurements taken 30, 90 and 120 minutes following consumption
showed an almost immediate benefit among people who had drunk green tea,
he said.

Heart disease is the world's leading cause of death. It is caused by
fatty deposits that harden and block arteries, high blood pressure which
damages blood vessels, and other factors.

While the researchers looked only at a short-term impact, Vlachopolous
said the team's not-yet-published studies suggest the protection is long
lasting.

"Green tea is consumed less in the Western world than black tea, but it
could be more beneficial because of the way it seems to improve
(circulatory) function," he said. (Editing by Bate Felix)