You have to take studies with a grain of salt and use some of your own common sense. Consider that our bodies are made up of 55-75 percent water and that water is constantly needing to be replenished. It only makes sense to keep drinking water if you want all your parts to keep running smoothly and looking good, like your skin. And I agree, the 8-10 glasses is just an average. Use your own gauge and that is your pee. If it's yellow, not light amber, you need to drink more.