Web Exclusive: What's surprising about caffeine!

Web Exclusive

(CNN) - Without that caffeine jolt, some of us have a hard time waking up.  Caffeine is America's favorite drug, but there are some surprising things you may not know about it.

This all coming to us from an article in Time magazine.  The author of the book "Caffeinated" sheds light on some caffeine secrets.  If we are talking about a hierarchy of caffeine levels.  Starbucks coffee is king.  Followed by energy drinks like red bull.  Even the 16-ounce ones like Monster and Rockstar only have about half the amount of a drip-brewed Grande coffee.

According to the author, even with coffee shops on every street, we drink less coffee than people did in the 50's.  Even so, coffee accounts for about two-thirds of our caffeine intake.  This perhaps is most interesting of all, it doesn't take much to become dependent on caffeine.

As little as 100 milligrams a day, three Cokes or two bags of Lipton tea, are enough to get you hooked and make you feel withdrawal symptoms if you try to give it up quickly.


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