Caffeine Effects: Withdrawal, Sleep & Health Impact

Caffeine impacts everything from sleep quality to concentration and heart rate. Learn how long withdrawal takes, the diuretic effects on the body, and the potential risks of taking caffeine tablets with medication or alcohol.

Pleased black haired woman drinking coffee

Caffeine After a Workout

Research indicates that pre-race caffeine can improve your performance, especially in endurance contests. As health writer Gina Kolata notes in "The New York Times," researchers have been publishing caffeine studies since 1978. "And in study after study, they concluded that caffeine actually does improve performance."

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