Tea is a tropical and subtropical plant which is scientifically known as
Camellia Sinensis. From approximately 3000 types of tea result of
cross-breeding, the results obtained are 3 kinds of tea process, namely
green tea, oolong tea, and black tea. The way is to chop tea processing
tea leaves and dried in the sun so that the chemical changes before
being dried. The treatment will cause the leaves to brown color and
gives black tea flavor characteristics.
Green tea, types of tea
oldest, well-liked, especially by the people of Japan and China. Here
the tea leaves undergo little processing, heating and drying that only
green leaf color can be maintained. While oolong tea is more a kind of
transition between black tea and green tea. The three types of tea each
have health benefits because it contains polyphenols called biochemical
bond, including flavonoids. Flavonoids are a group of antioxidants that
are naturally present in vegetables, fruits, and beverages such as tea
and wine.
Subclass of polyphenols include flavonols, flavones,
flavanones, anthocyanidins, catechins, and biflavan. Derivatives of
catechins such as epi-catechin (EC), epigallo-catechin (EGC), catechin
gallate-epigallo (EGCG) and quercetin is commonly found in tea. EGCG and
quercetin is a powerful antioxidant with a strength of up to 4-5 times
greater than vitamin E and C, which also are potent antioxidants.
Antioxidants are known to prevent the cells from damage since any damage
to the cells will contribute more than 50 diseases.
Green tea
contains EGCG, as well as black tea, says a biochemist. In a study by
Dutch researchers say, consume 4-5 cups of black tea every day will
reduce the risk of stroke by 70% compared with those who drank 2 cups of
tea a day or less. Other reports mention more black tea consumption was
associated with lower rates of heart attack. John Folts, director of
the Medical School, Center for Research and Prevention of Arterial
Thrombosis, University of Wisconsin, USA, discover the key properties of
flavonoids in tea. Research results showed that flavonoids in black tea
can inhibit the clotting of blood platelet cells thus preventing the
clogging of blood vessels in coronary disease and stroke hantung.
Another study mentioned that fanatical tea drinkers had higher levels of
cholesterol and low blood pressure, although it remains unclear whether
it is directly caused by the tea.
Researchers at Case Western
Reserve University, Cleveland, USA to find the effect of the use of
green tea on the skin up to 90%. Apparently tea is very effective in
protecting the skin from the sun can cause skin cancer. Tea also
contains fluoride which is known to strengthen tooth enamel and helps
prevent tooth decay. In a laboratory study in Japan, researchers found
that tea helps prevent the formation of dental plaque and kill bacteria
cause inflammation of the gums.
Research in Japan showed that its
occupation of tea producing region known as fanatic tea drinker, very
low mortality rate due to cancer. Another study, carried out cooperation
between research teams Oguni and cancer research center in Beijing to
study the effects of green tea extract on mice that had been given food
rations carcinogenic (cancer-triggering substances). Reportedly, the
average rate of cancer in mice that received green tea extract half of
the mice that did not receive the green tea extract.
The
researchers believe that known as catechin polyphenols found in green
tea, help the human body fight cancer cells. Another study conducted by
Oguni and Dr.. Masami Yamada of the Hamamatsu Medical Center found
cathecin kill Helicobator pylori, the bacteria trigger stomach cancer.
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