Green Tea - Green Tea The Healthy Choice Archeological...

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Green Tea – The Healthy Choice Archeological evidence suggests that tea leaves steeped in boiling water were consumed as many as 500,000 years ago. Botanical evidence indicates that India and China were among the first countries to cultivate tea. Today, hundreds of millions of people drink tea around the world, and studies are now suggesting that one variety of tea in particular -- green tea otherwise known as Camellia sinensis, has many health benefits. Green, black, and oolong tea are all derived from the leaves of the Camellia sinensis plant. Originally cultivated in East Asia, this plant grows as large as a shrub or tree. Today, Camellia sinensis is grown throughout Asia and parts of the Middle East and Africa. Green and oolong tea are more commonly consumed in Asian countries, while black tea is most popular in the United States. Green tea is prepared from unfermented leaves, the leaves of oolong tea are partially fermented, and black tea is fully fermented. The more the leaves are fermented, the lower the polyphenol content and the higher the caffeine content (Taylor, page 117). Green tea has the highest polyphenol content while black tea has roughly two to three times the caffeine content of green tea. Green tea is tea in its freshest, least processed form. The tea leaves are steamed to soften them, then rolled and dried. Black tea suffers a good deal more to make its way to your teacup. The leaves are withered by air or heat, the broken so that oxygen interacts with enzymes in the leaf. This begins a process of fermentation that darkens the tea and continues until it is heated to make your drink. 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
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This note was uploaded on 04/04/2008 for the course ENG 101 taught by Professor Lewis during the Fall '07 term at SUNY Plattsburgh.

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Green Tea - Green Tea The Healthy Choice Archeological...

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