Green tea prolongs life, Japanese study finds!
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A study conducted in Japan on more than 40,000 men and women has found that those who drink a lot of green tea live longer, researchers said on Tuesday.
The investigation by Dr. Shinichi Kuriyama and colleagues at the Tohoku University School of Public Policy, Sendai , Japan , found the beverage was particularly effective in fighting heart disease but did not reduce the death rate due to cancer, as some earlier animal studies had suggested. |
Polyphenols - plant compounds known to be antioxidants -- found in green tea may explain the life-prolonging benefit it confers, said the study.
The 11-year study was conducted in northeastern Japan , a region where 80% of the population drink green tea and more than half drink three or more cups daily.
Those involved in the study ranged in age from 40 to 79 and had no history of stroke, heart disease or cancer when the study began in 1994.
Those who drank five or more cups of green tea a day had a death rate overall and from heart disease in particular that was 16% lower than those who drank less than one cup daily, over the course of 11 years.
Over the first seven years of the study the death rate of the heavy tea drinkers was 26 percent lower.
Where heart disease was concerned the effect was stronger among women than men in the study, perhaps because men were more likely to be cigarette smokers, the authors reported.
Tea of all kinds is the most consumed beverage in the world aside from water, while heart disease and cancer are the two leading causes of death worldwide.
The authors said the apparent protective effect found was not likely to be the result of tea drinkers in the study somehow being more health conscious, since almost all Japanese consume green tea as one of their favorite beverages regardless of their other health habits.
The study was paid for by Japan 's Ministry of Health, Labor and Welfare.
"To our knowledge, this is the first study showing that green tea catechins have potent in vivo chemoprevention activity for human prostate cancer," Bettuzzi noted.
"The interest in green tea catechins and other polyphenols -- antioxidants found in many plants -- derives from traditional Chinese medicine, but the Mediterranean diet is very rich in vegetables, thus providing high levels of polyphenols, and lower rates of prostate cancer are found in that region as well," he pointed out. |
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