What is the Difference Between Green Tea and Black Tea?

[Guest guest]

What is the Difference between Green tea and Black tea?

 

Both green tea and black tea are derived from the same plant, the tea plant

(Camellia sinensis). Green tea is produced by lightly steaming the fresh-cut

leaf, while to produce black tea the leaves are allowed to age (oxidize). Oolong

tea is a partially oxidized.

 

During oxidation, enzymes present in the tea convert many " polyphenol "

substances that possess outstanding therapeutic action to compounds with much

less activity.

 

With green tea, oxidation is not allowed to take place because the steaming

process inactivates these enzymes.

 

Preliminary studies have demonstrated that green tea exerts significant

protective effects against cancer while black tea consumption increases the risk

for certain cancers (e.g., cancer of the rectum, gallbladder, and endometrium).

 

The major anticancer compounds in green tea are the polyphenols. The forms of

cancer that appear to be best prevented by green tea are cancers of the

gastrointestinal tract including cancers of the stomach, small intestine,

pancreas, and colon; lung cancer; and estrogen-related cancers including most

breast cancers.

 

Green tea polyphenols are potent antioxidant compounds that have demonstrated

greater antioxidant protection than vitamin C and E in experimental studies.

And, in addition to exerting antioxidant activity on its own, green tea

increases the activity of antioxidant enzymes.

 

One cup of green tea usually contains about 300 to 400 mg of polyphenols and

between 50 to 100 mg of caffeine. Commercial preparations are available that

have been decaffeinated and concentrated for polyphenols, anywhere from 60% to

80% total polyphenols.

 

http://www.doctormurray.com/Qarchive/tea.htm

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