you dont know this person, you do not know if they need more water than you are advising? Do you know if the person you are advising to drink LESS has any medical problems? Do they do alot of exercise or are they very active? I just think you need to be more careful about telling people to only drink when they are thirsty, or to only drink 2 litres! For example, I have kidney problems, have only 1 kidney now, i am under medical supervision whilst doing cambridge and have been advised to make sure i drink alot of water, ie. more than the 2 litres you are advising. Are they wrong? Should I ignore my doctor because someone on a forum says im doing it wrong? I doubt it! Just think before you put everyone is the same box. On a different matter... If you did cambridge to lose your weight then why are you on other posts saying how bad aspartame is? Have you forgotten how much you ingested yourself to get your weight off? You just think you know it all, just because you are a 'doctor'. My uncle is a doctor too, but he knows nothing about how much water to drink, hes a doctor of engineering, it means nothing!