HealthandDiets.com - Green tea extract may be dangerous if used excessively

Green tea extract may be dangerous..KEYWORDS: green tea studies effects of large doses of green tea and cancer treatment A University of Mississippi study said Wednesday that supplements made from concentrated tea extract may help certain tumors survive and grow.

The study, published in a recent issue of the Journal of Natural Products, examined the effect of high doses of the active ingredients in green tea extract on hypoxia-inducible factor-1, a key regulator of how tumor cells adapt to low-oxygen conditions. The scientists found the large doses of the suppliments, meant to prevent and fight cancer, may actually help the tumors survive. "Drinking green tea still is good for you," said Yu-Dong Zhou, lead study author and molecular biologist at the university's National Center for Natural Products Research. "There are thousands of years of evidence on that, but the idea of taking the equivalent of hundreds of cups of tea a day is something that needs to be looked at carefully."