زبان انگلیسی

Drug or Not?

Call it
"joe" or "java," the question"s the same:

Is coffee a drug?

Actually, not. But the morning go-getter and
after-dinner picker-upper contains one: caffeine.

Caffeine occurs naturally in the leaves,
seeds and fruits of more than 60 plants, including coffee, tea leaves, kola
nuts and cocoa beans.

Caffeine narrows blood vessels in the brain
and stimulates the cerebral cortex, the brain"s outer sheath. This helps you
think more rapidly and clearly. Elsewhere in the body, blood vessels expand.
Coordination improves.

Caffeine is used medically as a mild
stimulant or headache-killer. Caffeine citrate helps in treating sleeping
problems in newborns.

In healthy people, moderate amounts of
caffeine have little effect on blood pressure or heart rate. Bigger doses can
cause agitation and ringing in the ears, muscle tremors and irregular
heartbeat. If you quit coffee cold, you may experience headache, nervousness,
anxiety dizziness and irritability.

Remember, though, coffee isn"t a drug. It"s
not primarily used to cure, relieve or prevent illness.

Even so, if you think early morning fatigue
is a disease, nobody"s going to stop you from taking your medicine!

"Coffee: Drug or Not?" was
adapted from a commentary originally produced for Medicine Chest, a radio program produced by the
Higuchi Biosciences Center and the Drug Information Center at the University of
Kansas. Medicine Chest airs weekly on eight Kansas radio stations.