A new study has produced what seems to be conclusive evidence that a cup of green tea a day will help to keep your heart healthy.
Image by Syntagma Photographic
In tests, the beverage was discovered to widen the artery that runs from the shoulder to the elbow by 4pc within 30 minutes. Using ultrasound scanning to measure the performance of the brachial artery, this was taken as a good indicator of improved blood flow around the body.
The report, by Dr Nikolaos Alexopoulos and colleagues at the 1st Cardiology Department, Athens Medical School, and published in The European Journal of Cardiovascular Prevention and Rehabilitation, claims this is the first time green tea has been demonstrated to have a short-term beneficial effect on the large arteries.
The experiment involved a team of healthy volunteers who were given green tea, caffeine or hot water to drink on three separate occasions. Measurements of the brachial artery were taken at three stages after they drank their beverage.
While green tea had a marked effect, caffeine and hot water had none.
According to the team, dilation of the artery shows better functioning of the endothelium, the layer of cells lining blood arteries that stops clots forming.
Previous research had suggested black tea improves short and long-term endothelial performance, but this is the first time green tea has been shown to have a short-term beneficial effect on the large arteries.
Another study has already shown that green tea reverses endothelial dysfunction in smokers.
However, the fermentation process used to make black tea reduces the content of flavonoids — beneficial antioxidants — by up to 90 per cent, which is why green tea is believed to offer superior health benefits.
One of the researchers, Dr Charalambos Vlachopoulos said, “These findings have important clinical implications. Tea consumption has been associated with reduced cardiovascular morbidity and mortality in several studies. 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 endothelial function. Recent studies have also shown potent anticarcinogenic effects of green tea, attributed to its antioxidant properties.’
Yet more research shows drinking green tea lowers “bad” cholesterol and blood pressure, and reduces harmful liver enzymes.
Even more, drinking green tea could help ward off cancer, with a study showing that just four cups of green tea a day reverses cell damage in heavy smokers and hence the development of tumours. Japanese researchers also found that a green tea and exercise regime reduced the usual drop in strength and muscle performance associated with getting older.
To back all that up, Brazilian scientists showed that drinking three cups of green tea a day reduced damage caused by resistance training.
Green tea really is the bee’s knees — and probably the cat’s whiskers too.