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Vitali-Tea - Tea fits a healthy lifestyle to a T... Darrell Miller 6/13/05



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Vitali-Tea - Tea fits a healthy lifestyle to a T...
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Date: June 13, 2005 09:45 AM
Author: Darrell Miller (dm@vitanetonline.com)
Subject: Vitali-Tea - Tea fits a healthy lifestyle to a T...

Vitali-Tea by Leah Brinks Energy Times, October 9, 2003

If the research is even only half right, tea fits a healthy lifestyle to a T. Whenever scientists look at a teapot's contents, they find striking health benefits: Heart protection. Reduced cancer risk. Better skin.

All of these are apparently in the bag when you choose to drink tea. Tea green, tea black: Which to choose? Actually, both types come from the same plant, Camellia sinensis. Green tea is steamed and dried; black tea is fermented, which allows its darker color to develop. Some lesser-known types include white tea, which is actually green tea that undergoes the most minimal of handling. (Another rare white tea, white cantaloupe, is rich in antioxidants.) Oolong is a tea that falls between green and black in processing and flavor.

One increasingly popular tea color, red, is not tea at all, but an herbal brew called rooibos (technically, herbal teas are known as tisanes). This South African plant yields a citrus-flavored beverage high in vitamin C. Other herbs known for yielding flavorful infusions include chamomile, used to promote sound sleep; peppermint, a digestion easer; and rose hips, which, like rooibos, combines healthy vitamin C levels with a delightfully zesty taste.

Toxin Blocker

The evidence for tea's health benefits has practically boiled over. For instance, researchers at the University of Rochester have found that green tea substances inhibit the action of a molecule irritated by tobacco smoke, a toxin central to tobacco's cancer-causing danger. This action, say the scientists, may be the reasons that smokers who drink tea suffer less cancer (Chem Res Tox 7/21/03).

The Rochester researchers found that tea helps protect a cellular molecule called the aryl hydrocarbon (AH) receptor. Ordinarily, AH is frequently disturbed by toxic substances that cause cancer and other illnesses. Tobacco smoke (as well as the pollutant dioxin) interacts with AH to initiate cancer and other problems.

But at least two chemicals in green tea-epigallocatechingallate (EGCG) and epigallocatechin (EGC)-interfere with AH's harmful activity. These substances, flavonoids similar to healthful chemicals found in grapes, wine and cruciferous vegetables like broccoli, have been shown to lower cancer risk.

"It's likely that the compounds in green tea act through many different pathways," says Thomas Gasiewicz, professor and chair of Environmental Medicine and director of Rochester's Environmental Health Science Center.

In the Rochester study, Dr. Gasiewicz and his colleagues found that EGCG and EGC close down the AH receptor in cancerous animal cells and most likely produce the same benefit in human cells.

Still to be made clear is how tea is metabolized when the body digests tea, but the Rochester scientists are still peering through their microscopes and teapots to find out.

Tea Protection

Scientists at the Linus Pauling Institute at Oregon State University have found that drinking green or white tea can significantly lower your risk of colon cancer as well the prescription drug sulindac, which has been shown effective for people at high tumor risk (Carcinogenesis 3/03).

"Tea is one of the most widely consumed beverages in the world, and recent upswings in the sales of green tea in the United States can be attributed to reports of potential health benefits against cancer and other chronic diseases," says Gayle Orner, an OSU research associate. "Teas exert significant protective effects in experimental animal models of skin, lung, esophageal, gastric, hepatic, small intestinal, pancreatic, colon, bladder and mammary cancer."

While many people today take aspirin and similar drugs that have been shown to lower cancer risk, this study shows that drinking tea and taking low doses of these drugs, called NSAIDs, can reduce the risk even further. (High doses of NSAIDs, while protective against colon cancer, can cause internal bleeding.)

"These are pretty exciting results," Orner says. "What's especially significant is that as far as we can tell consumption of tea has none of the side effects of NSAIDs, which can be severe, including bleeding, ulcers and even death."

In this research on animals, use of tea dropped the risk of cancer by about two-thirds. According to the lab results, drinking about three large cups of tea a day should provide significant cancer protection. Based on research in Japan that looked at how green tea lowers the risk of stomach cancer, the Linus Pauling scientists urge plenty of tea drinking: "The more the better."

Tea Surprise

Studies show that nations of tea drinkers have less trouble with their hearts than residents of places where tea is hardly ever brewed. And now research is starting to zero in on the substances in tea that benefit heart health.

A study of 240 Chinese men and women who have high cholesterol has found that chemicals in tea can significantly drop harmful cholesterol (Arch Int Med 6/23/03).

"Personally, I was very surprised," says David J. Maron, MD, professor at the Vanderbilt University Medical Center, lead author of the study. "I expected, if anything, a very slight cholesterol-lowering effect. But what we saw was a 16% reduction in low density lipoprotein (LDL) cholesterol."

LDL cholesterol is known as "bad" cholesterol because it can increase your risk of heart disease.

The researchers in this study gave people extracts of green and black tea enhanced with theaflavin, an antioxidant also found in green tea.

In the future, if past results are any indication, tea's rich supply of beneficial chemicals will continue to pleasantly surprise researchers with even more benefits.



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