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sixfourtykilo t1_ixv7y3k wrote

Well, to start with, caffeine. Caffeine is a diuretic, which dehydrates you.

This is true of any caffeinated beverage really.

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Applejuiceinthehall t1_ixw10g2 wrote

It is, but people who drink 4 or more cups of coffee a day aren't less dehydrated than people who don't drink that much.

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