Black Tea, Green Tea Good for Diabetes
In Rats, Black and Green Tea Lower Blood Sugar, Prevent Cataracts
By Daniel DeNoon
WebMD Medical News Reviewed By Brunilda Nazario, MD
on Wednesday, April 20, 2005
April 20, 2005 -- Both black tea and green tea are good for diabetes, a rat study shows. They also prevent diabetic animals from developing cataracts.
The findings appear in the May 4 issue of the Journal of Agricultural and Food Chemistry.
"Black and green tea represent a potentially inexpensive, nontoxic, and, in fact, pleasurable [blood-sugar-lowering] agent," the researchers write. "Tea may be a simple, inexpensive means of preventing or retarding human diabetes and the ensuing complications."
In the study, the researchers gave green and black teas to diabetic rats for three months.
They found both kinds of tea inhibited diabetic cataracts. The teas also had a blood-sugar-lowering effect.
To get the same dose of tea given to the rats, a 143-pound person would have to drink 4.5 8-ounce cups of tea every day.
The researchers recommend that tea -- black and green -- should be studied for an antidiabetes effect in humans.
Tea may help prevent diabetes and cataracts
Main Category: Nutrition / Diet News
Article Date: 19 Apr 2005 - 0:00 PDT
Add another line to the list of benefits from drinking tea: New research in animals suggests that tea may be a simple, inexpensive means of preventing diabetes and its ensuing complications, including cataracts. The report, scheduled to appear in the May 4 print issue of the American Chemical Society's Journal of Agricultural and Food Chemistry, was published March 31 on the journal's Web site. ACS is the world's largest scientific society.
Researchers fed green and black tea to diabetic rats for three months and then monitored the chemical composition of the rats' blood and eye lenses. At levels that would be equivalent to less than five cups of tea per day for a human, both teas significantly inhibited cataract formation relative to a control group which did not get tea, they say. The researchers found that both teas decreased glucose levels, which in turn affects other biochemical pathways that accelerate diabetic complications such as cataracts.
"Most people, scientists included, believe that green tea has more health benefits than black tea," says Joe Vinson, Ph.D., a chemist at the University of Scranton (Penn.) and lead author of the paper. In combination with Vinson's earlier research showing that green tea and black tea equally inhibit atherosclerosis - a major risk factor for heart disease - the findings suggest that both drinks could play a part in curbing two of the most widespread maladies in the United States today.
The American Chemical Society is a nonprofit organization, chartered by the U.S. Congress, with a multidisciplinary membership of more than 158,000 chemists and chemical engineers. It publishes numerous scientific journals and databases, convenes major research conferences and provides educational, science policy and career programs in chemistry. Its main offices are in Washington, D.C., and Columbus, Ohio.
Contact: Michael Bernstein
American Chemical Society