>>10868015not. an. argument.
pre historic humans never had constant access to 8 glasses worth of drinking water a day, so why would it suddenly become healthy for us to drink that much?
think for a moment.
what happens when you shower too often? your skin gets dry. what happens when you wash your hands too much? they get dry. same thing happens inside your body. For example water dilutes and dissolves the mucus within your body, leaches minerals etc. Water is a natrual solvent, that why metal rusts when you it gets exposed to water.