The July 3rd 2008 edition of ‘Science Daily’, reported that, a new study suggests regular consumption of green tea rapidly improves the functioning of endothelial cells (lining in the circulatory system). Endothelial dysfunction is a major factor behind the progression of Artherosclerosis.
The study, led by Dr. Nikolaos Alexopoulos and his colleagues at the first Cardiology Department, at Athens Medical School in Greece, conducted a random trial involving the dilatation of the brachial artery of healthy volunteers on three different occasions, such as, after having green tea, caffeine and hot water (placebo effect). The measurements were taken at a gap of 30, 90 and 120 minutes after consumption.
The results showed that endothelium-dependent brachial artery dilatation significantly increased after drinking green tea, with a maximum increase of 3.9 percent 30 minutes after consumption. The effect of caffeine or hot water consumption, on the other hand was insignificant.
While it is known that black tea helps improve short and long-term endothelial performance, it is for the first time that green tea has shown to have short-term beneficial effect on large arteries.
In yet another study green tea has shown to reverse endothelial dysfunction among smokers. The studies have also shown potent anti-carcinogenic results of green tea, due to its antioxidant properties.
After its origin in China, Green Tea is now consumed throughout the world, and is made of pure leaves, after having undergone little oxidation during processing. The cardiovascular benefits of all teas, just as in dark chocolates or red wine, are attributed to flavanoids, containing high levels of antioxidant properties.
Dr. Charalambos Vlachopoulos, says green tea has more potent antioxidants than in black tea, as there has been no oxidization. Several studies have revealed that tea consumption is associated with reduced cardiovascular morbidity and mortality.
Several cups of green tea a day would probably be a good dose for people. This is the first study to show these effects for green tea. It should be noted that the results are evident quite rapidly within 30 minutes of consumption, said Vlachopoulos.