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Green Tea May Protect Against Breast Cancer
While tea has been used as an alternative medicine in China for the last
several thousand years, it is only recently that the Western hemisphere
started to take notice of the beverage¹s potential health benefits,
according to University of Southern California researchers. Now, tea is
being hailed as a miracle elixir with the power to do everything from
lower
stress hormones and sooth the symptoms of PMS to protect against disease.
Although many of the claims are unproven, tea has been shown to reduce the
risk of certain kinds of cancer, says Carol Koprowski, Ph.D., R.D.,
assistant professor of preventive medicine at the Keck School of Medicine
of
USC.
³The tea that has been studied the most is green tea,² she notes. ³It¹s
one
of the few teas out there that has been shown to have antioxidants that
may protect against cell damage
Epidemiologist Anna Wu, Ph.D., professor of preventive medicine at the
Keck
School, is studying the relationship between green tea consumption and
breast cancer risk. An earlier study about breast cancer risk among
Asian-American women showed that green tea intake had a strong protective
effect, while the more commonly consumed black tea had no effect at all,
she
says.
While both green and black teas come from the same Camellia sinensis plant
native to Asia, the leaves are processed differently. Black tea leaves go
through a fermentation process that strips the plant of its natural
polyphenol compounds, which are believed to give the tea its antioxidant
properties, Wu says.
Results from a small pilot study suggest that regular green tea drinkers
had
lower blood estrogen levels, while regular black tea drinkers had higher
blood estrogen levels. Higher levels of estrogen are associated with
breast
cancer risk, Wu explains.
While green tea is gaining in popularity around the world in part due to
reports of its disease fighting properties, consumption still lags far
behind black tea in most cultures. Regardless of whether the benefits are
as
widespread as some reports claim, a few cups of either green or black tea
is
a smart addition to a diet as a replacement for high-calorie sodas and
fruit
drinks.
Wu, a life-long black tea drinker, says she hasn¹t given it up but now
drinks at least one cup of green tea a day as well.
University of Southern California
http://www.usc.edu
Ceai verde pot proteja împotriva cancerului mamar - Green Tea May Protect Against Breast Cancer - articole medicale engleza - startsanatate