According to that website, I'd have to drink 80-100 cups for a fatal dose. Or take 50 caffeine pills.
Quote:
One effect of caffeine is to interfere with adenosine at multiple sites in the brain including the reticular formation. Caffeine also acts at other sites in the body to increase heart rate, constrict blood vessels, relax air passages to improve breathing and allow some muscles to contract more easily.
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Hey, it improves breathing?
Other interesting facts: Per ounce, Red Bull has slightly less caffeine than coffee (pretty much the same) while a drink called SoBe No Fear has twice as much.