Video of the week│TED-Talks│4:22 min.

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.