It seems obvious, but sometimes we don't event notice under-hydration. You may be surprised at some of the symptoms! Here's an interesting read by Matt Duczeminski.
There’s not much in this world more refreshing than a tall, ice-cold glass of water. I don’t think there’s anyone alive that can deny that sometimes, a simple glass of water can be more satisfying than a cup of coffee or a can of soda. Despite this, too many of us don’t drink enough water on a daily basis. By d