wu long tea,Oolong ,烏龍茶:2007年10月

＞ < 2007年 10月 >

• Put the kettle on: Tea is steeped in health benefits
  [ 2007-10-01 14:40 ]

＞ Put the kettle on: Tea is steeped in health benefits

Put the kettle on: Tea is steeped in health benefits
From : www.usatoday.com/news/health/2007-10-07-tea-benefits_N.htm?csp=34
...More recently, Foxe says, he has found that as little as 100 milligrams of theanine enabled people to focus better on complicated tasks, but only when consumed with 60 milligrams of caffeine - a combination found in roughly four cups of green tea (which contains half as much caffeine as black).

"There was a profound synergistic effect," he says. "My take is, we're all self-medicating with this."

Just because drinking tea might be good for you doesn't mean adding tea extract to cereal and other foods or to dietary supplements is beneficial. "A lot of that is gimmick," Mukhtar says of products that tout tea extract as an ingredient.

A paper published in April suggests one danger of such products with high doses of green tea extracts. "There are quite a few case reports on liver damage due to taking supplements that contain tea extracts," says biochemist Chung Yang, a Rutgers University cancer researcher who co-wrote the paper in the journal Chemical Research Toxicology.

Liver function returned to normal when those affected stopped taking the supplements, Yang and his co-authors write. In addition, they say, studies in rodents and dogs suggest that high doses of tea catechins can damage the kidneys and intestine as well as the liver.

Green tea: Leaves are immediately steamed, rolled and dried.

Oolong tea or wu long tea: Falls between green and black teas in terms of amount of oxidation.

White tea: The least processed of all teas, it is also the least studied.