From Lies My Doctor Told Me, Second Edition by Ken Berry, MD
You should drink at least eight glasses of water a day. Or more!
This lie likely comes from a recommendation the Nutrition Council made in the 1940s. That group recommended we ingest 64 ounces of fluids each day, but that recommendation was intended to include the water in the food we eat and in beverages other than water. No research has ever shown that you need a certain amount of clear water each day for health or weight loss. However, it’s probably a good idea for you to drink a few glasses of good water every day. Your thirst mechanism is hard-wired, and it’s very good at telling you how much fluid you need each day. It doesn’t need your help in deciding how much water you should drink.
I’ve been feeling guilty because I simply do not enjoy, so am not, forcing myself to drink when I’m not thirsty.
It’s always seemed counterintuitive to me to say listen to our bodies when eating to satiety, then think we know better when it comes to fluids.