Caffeine Addicts Get No Additional Perk, Only a Return To Baseline

http://science.slashdot.org/story/10/06/02/219229/Caffeine-Addicts-Get-No-Additional-Perk-Only-a-Return-To-Baseline

"Bristol University researchers found that drinkers develop a tolerance to both the anxiety-producing and the stimulating effects of caffeine, meaning that it only brings them back to baseline levels of alertness, not above them. 'Although frequent consumers feel alerted by caffeine, especially by their morning tea, coffee, or other caffeine-containing drink, evidence suggests that this is actually merely the reversal of the fatiguing effects of acute caffeine withdrawal,' wrote the scientists, led by Peter Rogers of Bristol's department of experimental psychology."

This is rather obvious.  But, as I really don't like caffeine I felt the need to post it.