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Staying hydrated: Everybody needs water, but every body is different.(The Dallas Morning News)

We're all toting around bottles of water and running to the bathroom these days. But are we drinking too much or too little water? Should we be drinking plain water or sports drinks?

In animals, thirst is a delicately tuned mechanism that ensures a body gets exactly enough water. But humans can be out of touch with their thirst, just as our appetites can be out of whack with our actual hunger.

"The human race survived before we had bottled water," says Robert Alpern, a physiologist and dean of University of Texas Southwestern Medical Center at Dallas. "The problem is that humans eat and drink when they aren't hungry or thirsty."

Athletes pay a lot of attention to ...

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