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.

The Effects of Caffeine on Adenosine

Published Jul,08 2011 | By Helen Anderson

Occurring naturally in more than 60 plants, caffeine is a bitter substance that when consumed has stimulant properties. According to neurologist Dr. R. E. Shapiro of the University of Vermont, caffeine is the most widely consumed stimulant drug in the world.