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Studies suggest that tea -- especially green tea -- provides healthy
benefits.
Green tea leaves are the least processed and have lower levels of caffeine
than other types of tea. The leaves contain high-level antioxidants thought
to fight different types of cancer and also protect the heart by relaxing
blood vessels, which prevents blood clots.
Other studies suggest tea increases bone density, therefore reducing
the risk of fractures from osteoporosis.
The Miracle of Green Tea
Is any other food or drink reported to have as many health benefits as
green tea? The Chinese have known about the medicinal benefits of green
tea since ancient times, using it to treat everything from headaches to
depression. In her book Green Tea: The Natural Secret for a Healthier
Life, Nadine Taylor states that green tea has been used as a medicine
in China for at least 4,000 years. Today, scientific research in both
Asia and the west is providing hard evidence for the health benefits long
associated with drinking green tea. For example, in 1994 the Journal of
the National Cancer Institute published the results of an epidemiological
study indicating that drinking green tea reduced the risk of esophageal
cancer in Chinese men and women by nearly sixty percent. University of
Purdue researchers recently concluded that a compound in green tea inhibits
the growth of cancer cells. There is also research indicating that drinking
green tea lowers total cholesterol levels, as well as improving the ratio
of good (HDL) cholesterol to bad (LDL) cholesterol. To sum up, here are
just a few medical conditions in which drinking green tea is reputed to
be helpful
:
cancer
rheumatoid arthritis
high cholesterol levels
cardiovascular disease
infection
impaired immune function
What makes green tea so special?
The secret of green tea lies in the fact it is rich in catechin
polyphenols, particularly epigallocatechin gallate (EGCG). EGCG is a powerful
anti-oxidant: besides inhibiting the growth of cancer cells, it kills
cancer cells without harming healthy tissue. It has also been effective
in lowering LDL cholesterol levels, and inhibiting the abnormal formation
of blood clots. The latter takes on added importance when you consider
that thrombosis (the formation of abnormal blood clots) is the leading
cause of heart attacks and stroke. Links are being made between the effects
of drinking green tea and the "French Paradox." For years, researchers
were puzzled by the fact that, despite consuming a diet rich in fat, the
French have a lower incidence of heart disease than Americans. The answer
was found to lie in red wine, which contains resveratrol, a polyphenol
that limits the negative effects of smoking and a fatty diet.
In a 1997 study, researchers from the University of Kansas determined
that EGCG is twice as powerful as resveratrol, which may explain why the
rate of heart disease among Japanese men is quite low, even though approximately
seventy-five percent are smokers. Why don't other Chinese teas have similar
health-giving properties? Green, oolong, and black teas all come from
the leaves of the Camellia sinensis plant. What sets green tea apart is
the way it is processed. Green tea leaves are steamed, which prevents
the EGCG compound from being oxidized. By contrast, black and oolong tea
leaves are made from fermented leaves, which results in the EGCG being
converted into other compounds that are not nearly as effective in preventing
and fighting various diseases.
Other Benefits
New evidence is emerging that green tea can even help
dieters. In November, 1999, the American Journal of Clinical Nutrition
published the results of a study at the University of Geneva in Switzerland.
Researchers found that men who were given a combination of caffeine and
green tea extract burned more calories than those given only caffeine
or a placebo. Green tea can even help prevent tooth decay! Just as its
bacteria-destroying abilities can help prevent food poisoning, it can
also kill the bacteria that causes dental plaque. Meanwhile, skin preparations
containing green tea - from deodorants to creams - are starting to appear
on the market. Harmful Effects? To date, the only negative side effect
reported from drinking green tea is insomnia due to the fact that it contains
caffeine. However, green tea contains less caffeine than coffee: there
are approximately thirty to sixty mg. of caffeine in six - eight ounces
of tea, compared to over one-hundred mg. in eight ounces of coffee.
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