Why coffee doesn't work

A new study says that coffee drinkers don't actually get a boost in the morning — they just return to pre-addiction levels of alertness. Time to kick the habit?

Step away from that cup: Scientists say that caffeine doesn't wake us up, after all.
(Image credit: Corbis)

Think that morning cup of coffee makes you more alert? Think again. According to Peter Rogers at Britain's Bristol University, your first cup of joe, at best, just gets you back to the normal alertness level of non-caffeine addicts. What does this study tells us about "the most commonly used drug in the world," and its most devoted users?

How did the study work?

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