Most people (including doctors) say and also newspapers states that an average person should drink 2 litres (approximately 8 glasses) of water per day.
Even though this is very popular I have heard about this many times, I have never actually heard about the person who discovered this number and the history related to this.
And I don't know what these scientists exactly took into account when calculating this. I think this came from measuring how much water your body needs and the calculations said that 2 litres is the correct amount.
So therefore Im asking this over here.
Who was the scientist/group of scientists, and when and how did he find this number.