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Caffeine interferes with adenosine reception in the brain. Caffeine looks like adenosine to nerve cells so it binds to the receptors in the brain. The receptors don't sense the adenosine
http://answers.ask.com/Health/Pharmacy/how_does_ca...
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Explains the effects of caffeine on the brain and mental processes.
http://addictions.about.com/od/a.htm
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Caffeine increases the dopamine levels which may contribute to caffeine addiction. It is an addictive drug, affecting 90% of all Americans, which alters the brain's natural state,
http://answers.ask.com/Health/Pharmacy/how_does_ca...
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Side effects of caffeine include a fast heart beat, nausea, restlessness, anxiety, depression and more. Drinking a lot of liquids with caffeine can also lead to withdrawal symptoms
http://answers.ask.com/Health/Pharmacy/what_are_th...
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