Four Myths About Staying Hydrated Debunked

Lifehacker:

Your mom wasn't completely wrong about the need to stay hydrated in hot weather, but your sweet old mum, and many others, have been needlessly worrying about the wrong things. Here are four hydration myths you can safely discard.

1. "Drink eight glasses fo water a day"
2. "Caffeinated beverages don't count"
3. "Feeling thirsty is 'too late'"
4. "You need sports drinks for outdoor exercise"

Makes you wonder what other pieces of "common wisdom" many of us believe that simply are not true? Weight loss myths certainly abound. What else?