Dude no question about what you are saying but when they say vast majority of healthy people, they are talking about those who are active and work out daily. I am guessing they are drinking minimum of 6-7 glasses. What would you say to a person like me who spends 10 hours sitting on a chair in front of the computer and eating naan pakoray for lunch. Should not I put an extra effort to add more water to my diet even if I am not feeling thirsty?