Hydration: Attempt Only Under Medical Supervision

I've noticed how the word "hydration" has crept into the popular lexicon in the last decade or so. Before that, we were so primitive, we just "drank water". Now you need a PhD just to put a glass to your lips. I'm not sure I'm qualified!I've been hearing so many people, including health professionals, tell me to drink 8 glasses of water a day for my entire life. In my middle school health class,...