Decaf coffee still has caffeine

October 13, 2006|By NEWSDAY

Does that cup of decaffeinated coffee give you a jolt? It may, because almost all decaf coffee contains some caffeine, a new University of Florida study shows.

The results could have implications for people told to avoid caffeine because of certain medical conditions such as high blood pressure, kidney disease or anxiety disorders, according to the study reported in this month's Journal of Analytical Toxicology.

"If someone drinks five to 10 cups of decaffeinated coffee a day, the dose of caffeine could easily reach the level in a cup or two of caffeinated coffee," said co-author Dr. Bruce Goldberger.

Researchers purchased 10 cups of 16-ounce drip-brewed coffee from nine national chains and local coffeehouses and tested them for caffeine content.

Instant decaf Folgers Coffee Crystals had no caffeine, but the others contained 8.6 milligrams to 13.9 milligrams of caffeine. Typically, 16 ounces of drip-brewed coffee contain about 170 milligrams of caffeine.

Researchers also analyzed 12 samples of Starbucks decaffeinated espresso and brewed decaffeinated coffee. The espresso drinks had 3 milligrams to 15.8 milligrams each, while the brewed coffee had 12 milligrams to 13.4 milligrams per 16-ounce drink.

Even moderate caffeine levels can increase heart rate, blood pressure, agitation and anxiety in some people, Goldberger said.

Dr. Roland Griffiths, a professor of behavioral biology and neuroscience at Johns Hopkins School of Medicine, said caffeine levels as low as 10 milligrams can cause behavioral effects in sensitive individuals.

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