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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