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Nutrition, Vitamins & Supplements for Seniors
Green Tea Lowers Death Risk for Everything but
Cancer
Older Japanese adults show drop in
cardiovascular disease
 September 25, 2006 Drinking green tea appears to
lower the risk of dying from about anything except cancer, says a study
of Japanese adults. The more green tea the adults drank, the lower the
death risk from even cardiovascular disease, says the study in the
September 13 issue of JAMA. It seems to work best for women.
Tea is the most consumed beverage in the world
aside from water. Three billion kilograms of tea are produced each year
worldwide, according to background information in the article.
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Because of the high rates of tea consumption in the
global population, even small effects in humans could have large
implications for public health.
Among teas, green tea polyphenols have been
extensively studied as cardiovascular disease (CVD) and cancer
chemopreventive agents. Although substantial evidence from in vitro and
animal studies indicates that green tea preparations may impede CVD and
carcinogenic processes, the possible protective role of green tea
consumption against these diseases in humans remains unclear.
Shinichi Kuriyama, M.D., Ph.D., of the Tohoku
University School of Public Policy, Sendai, Japan, and colleagues
examined the association between green tea consumption and mortality
(death rate) due to all causes, CVD, and cancer within a large
population.
The study, initiated in 1994, included 40,530
adults (age 40 to 79 years) in northeastern Japan, where green tea is
widely consumed. Within this region, 80 percent of the population drinks
green tea and more than half of them consume 3 or more cups and day.
The participants, who had no history of stroke,
coronary heart disease, or cancer at baseline, were followed for up to
11 years (1995-2005) for all-cause death and for up to 7 years
(1995-2001) for cause-specific death.
Over 11 years of follow-up, 4,209 participants
died, and over 7 years of follow-up, 892 participants died of
cardiovascular disease and 1,134 participants died of cancer.
The researchers found that green tea consumption
was inversely associated with death due to all causes and due to
cardiovascular disease.
Compared with participants who consumed less than 1
cup aday of green tea, those who consumed 5 or more cups a day had a
risk of all-cause mortality and CVD mortality that was 16 percent lower
(during 11 years of follow-up) and 26 percent lower (during 7 years of
follow-up), respectively.
These inverse associations of all-cause and CVD
mortality were stronger among women, although the inverse association
for green tea consumption was observed in both sexes.
In women, compared with those who consumed less
than 1 cup a day of green tea, those who consumed 5 or more cups a day
had a 31 percent lower risk of CVD death.
The researchers found there no significant
association between green tea consumption and death from cancer. There
were weak or neutral relationships between black tea or oolong tea and
mortality.
"Clinical trials are ultimately necessary to
confirm the protective effect of green tea on mortality,"the authors
write.
Editor's Note: This study was supported by a Health
Sciences Research Grant for Health Services, Ministry of Health, Labour,
and Welfare, Japan.
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