Not only do you have to look at the quality of the water you drink, but whether you are drinking enough water? 75% of all people are chronically dehydrated. In 37% of us, the thirst mechanism is so weak that it is often mistaken for hunger. Here are some other facts:

Even MILD dehydration will slow down one's metabolism as much as 3%.
One glass of water shut down midnight hunger pangs for almost 100% of the dieters in a university study.

Lack of water is the number one trigger of daytime fatigue.

Preliminary research indicates that 8-10 glasses of water a day could significantly ease back and joint pain for up to 80% of sufferers.

Even a small drop of 2% in body water can trigger fuzzy short-term memory, trouble with basic math, and difficulty focusing on the computer screen.