How much water do you actually need a day?

Glowing skin, increased energy, higher mental function and weight loss: These are just a few of the benefits we have been promised for the low cost of 8 glasses of water a day. But can this magical elixir really do all that it claims? Dr. Jen Gunter takes us behind the fascinating (and scandalous) history of hydration pseudoscience, unpacks the investigative report that ROCKED the beverage industry, and sits down with a nephrologist who tells us what's fact and what's fiction about our kidneys. It will quench your thirst for the truth about hydration. You can read the text transcript for this episode at go.ted.com/BodyStuffTranscript1