Green Tea

Green Tea

Green Tea Polyphenols (GTP), particularly EGCG or EGCg (epigallocatechin gallate), not only inhibit an enzyme required for cancer cell growth, but also kills cancer cells with no ill effect on healthy cells.

Green Tea May Lower Colorectal Cancer Risk

As if green tea didn't have enough cheerleaders among the scientific community, a new study based in China has linked the traditional Asian quaff with reducing the risk for colorectal cancer by more than half.

Researchers from Vanderbilt University School of Medicine and colleagues from Shanghai Cancer Institute and the National Cancer Institute assessed the tea-drinking habits of nearly 70,000 Chinese women ages 40 to 70 in the Shanghai Women's Health Study. They performed in-person interviews with the subjects at the start of the study and reassessed tea consumption by survey two to three years later, following the women for a total of six years.
Subjects who reported regular tea drinking at the start of the study had a 37% lower risk for colorectal cancer as compared with those who never or occasionally consumed tea. And those who had drunk tea for most of their lives saw even more benefit, reducing their relative risk by up to 57%.

"The longer the duration of lifetime tea consumption, the lower was the risk of colorectal cancer," said Gong Yang, MD, MPH, an assistant professor at Vanderbilt and lead author of the study. The researchers published their findings in the journal Cancer Epidemiology Biomarkers & Prevention.

The amount of tea consumption was assessed in dry weight of tea leaves, not cups of tea, with the regular tea drinkers consuming about three to four grams of tea leaves on average, approximately two tea bags per day. Green tea is a rich source of polyphenols, antioxidants that are being heavily studied these days for potential health benefits. Other researchers have found that green-tea consumption may be linked with lower risk for certain other cancers, weight-loss help, improved heart health and possible protection against Alzheimer's disease.
Dr. Yang said this new study suggests that regular consumption of green tea may reduce colorectal cancer risk in women, and that the research team will further evaluate the association, looking at male subjects as well. About 60,000 men have been recruited to participate in the Shanghai Men's Health Study.

TO LEARN MORE: Gamer Epidemiology, Biomarkers & Prevention, June 2007; abstract at .

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