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Caffeinated Drinks
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Caffeine is slightly diuretic.  (It increases your urination a bit.)  So if you drink 8 ounces of coffee, you don’t get the same hydrating benefit as 8 ounces of water.  You do get some hydrating benefit, it just isn’t clear how much.  

 In the case of a cup of coffee, I would assume that 8 ounces would give you a hydrating benefit of at least 4 ounces of water.  In the case of energy drinks, the caffeine is so high that I’m not sure that you are getting any hydrating benefits. 

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