There is a great deal of research underway on the benefits of green tea consumption and a reduced risk of various cancers. Several studies have identified the green tea polyphenol epigallocatechin gallate (EGCG) as a potent chemopreventive agent that can induce apoptosis and suppress the formation and growth of human cancers, such as colorectal cancers. In a recent study, mice were treated with an agent that induces colon tumors and given water or green tea for four to eight weeks. The results showed that green tea significantly inhibited the formation of new tumors, but it was not effective against large tumors already present. Green tea administration also decreased the total levels of biomarkers involved in early colon cancer development.51 Another study examined green tea consumption in Chinese women age 40-70. In this study, the women who regularly drank green tea at the beginning of the study showed a 37% reduced risk of colorectal cancer compared to those who irregularly consumed green tea. According to the study, the risk reduction was related to the duration of lifetime green tea consumption and the dose of green tea regularly consumed. Overall, the women who consumed green tea both before the study started and during follow-up surveys experienced a 57% reduced risk of colon cancer.52
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