באדיבות מדיקונטקסט: Last Updated: 2001-07-19 16:58:43 EDT (Reuters Health)
WESTPORT, CT (Reuters Health) – Polyphenols, which are abundant in green tea, may help protect women against breast cancer, according to a preliminary report in the July issue of the Journal of Cellular Biochemistry.
Investigators found that rats that drank water containing green tea had reductions in the size of breast tumors compared with rats that drank only water. Additionally, the tumors of tea-drinking rats developed later and were less invasive.
Although data from animal studies cannot always be generalized to humans, the findings "suggest that green tea can be protective against breast cancer induced by environmental carcinogens," Dr. Gail Sonenshein told Reuters Health. Dr. Sonenshein, who is a professor of biochemistry at Boston University School of Medicine and Public Health, in Massachusetts, was the principal investigator.
While more research needs to be conducted, the findings, coupled with observations of lower rates of breast cancer in countries where green tea is consumed daily, suggest that green tea may benefit women as part of an overall healthy diet.
"I know of no major detrimental side effects when consuming 3 to 5 cups of green tea per day. Thus, I see no problems in drinking green tea now for prevention," Dr. Sonenshein said.
However, patients who are undergoing radiation or chemotherapy for breast cancer should consult with their doctors before drinking large amounts of green tea, she noted.
Polyphenols, which are potent antioxidants, are abundant in green tea, red wine and olive oil and may protect against various types of cancer, the authors speculate. Dry green tea leaves, which are about 40% polyphenols by weight, may also reduce the risk of cancer of the stomach, lung, colon, rectum, liver and pancreas, study findings have suggested.
J Cellular Biochem 2001;00:00-00.
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