I should probably mention its lesser known sibling, white tea.
The main difference between white and green tea is that white tea leaves are harvested at a younger age than the green tea leaves. It should be noted that white tea actually trumps green tea in several ways. First, whereas green tea is lightly fermented, white tea is totally unfermented leaving even more of the EGCG intact. Second, studies have shown that the young, white tea leaves retain antioxidants in higher concentrations than does green tea. In fact, the concentration of antioxidants in white tea is approximately three times higher than in green tea. Bottom line: anything we say about the health benefits of green tea also apply to white tea, but even more so.
1, 2, 3). Although the studies are conflicting, it's probably best to err on the side of caution. The studies are far less conflicted when it comes to milk reducing the antioxidant potential found in dark chocolate. The mechanism is simple. The caseins in the dairy interact with the polyphenols in the tea or chocolate and decrease their effectiveness. Then again, if you use a concentrated, full-spectrum green tea extract, you avoid the problem altogether.
Green tea health benefits
As I mentioned earlier, the reported benefits of green tea are multitudinous…and well studied. For example, green tea inhibits tumor growth in a variety of cancers, including: breast, lung, and prostate cancers. Specifically, the EGCG in green tea works to suppress angiogenesis, the growth of blood vessels that tumors need to survive. And if that's not enough -- stopping the growth of cancer at the front end -- green tea polyphenols have been shown to inhibit metastasis, the spread of cancer at the back end. And finally, EGCG is the first known natural telomerase inhibitor. That is to say, it eliminates the "immortality" of cancer cells which is their trademark and which makes them so deadly. The bottom line is that green tea is particularly effective in destroying the causes of leukemia, prostate cancer, breast cancer, and seems to provide the best protection known in terms of preventing lung cancer. And green tea seems to be able to almost totally prevent cancer causing DNA damage in smokers -- a possible explanation as to why the Japanese, who are among the world's heaviest smokers, have such a low incidence of lung cancer.
And the benefits of green tea don't stop there. It has also been shown to be effective in regulating blood sugar, reducing cholesterol and triglycerides, and in reversing the ravages of heart disease. (Incidentally, the Japanese, who drink large amounts of green tea, have some of the lowest rates of cardiovascular disease in the world.)
And finally, green tea has great benefits for the brain as well. It serves as an effective MAO inhibitor. It also protects against brain-cell death from glucose oxidase, over-production of nitric oxide, and it lowers the amount of free iron reaching the brain (a bad thing). The net result is that there are strong indications that green tea extract may play a major role in protecting against both Parkinson's and Alzheimer's disease.
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