Why you don't need 8 glasses of water a day | Jen Gunter - a podcast by TED

You know the old rule that you need to drink eight glasses of water every day? It's simply a myth, says Dr. Jen Gunter. In this episode, she explains the amazing way your kidneys keep your system in balance -- and how you can really tell if you're dehydrated. Want to hear more from Dr. Gunter? Check out her podcast Body Stuff, from the TED Audio Collective.

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