2012年11月8日星期四

Green Tea Consumption Versus Cancer Risk



Keeping the above definitions in mind, recent meta-studies show the following levels of consumption may reduce cancer risk as indicated.

5 cups/day or more:
- 56% less oral cancer
- 54% less prostate cancer
- 42% less liver cancer
- 22% less endometrial cancer

2 cups/day or more:
- 18% less lung cancer (for general population)

1 cup/day or more:
- 60% less lung cancer (for female non-smokers)
- 44% less ovarian cancer

Most people taking part in the above studies consumed a maximum of 5 cups per day (very few consumed 10 or more), which limits how much risk reduction was experienced. This level still offers good protection from several major cancers. The risk reduction is not so clear yet for cancers of the breast, colon, stomach or pancreas - they may require even higher levels of consumption. Note: smoking seriously decreases the benefits of green tea against lung cancer, which is why non-smoking women see a 60% risk reduction with just 1 cup daily; whereas, the general population (smokers included) need 2 cups daily just to realize an 18% risk reduction. For most cancers, there is a "dose-response" relationship in which more green tea leads to greater reduction of cancer risk. For example, every 2 additional cups daily leads to an additional risk reduction of 18% for lung cancer and 22% for prostate cancer.

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