# History related to the "2 litres of water per day" theory

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.

• Obviously, "8 glasses" is not the essential content of the statement. The point is that a human should consume approximately X (2 liters?) amount of water a day: One could ask about this in a more direct and to-the-point fashion, without referring to the "8 glasses" stuff at all, and this would significantly improve the question.
– Danu
Commented Nov 15, 2014 at 17:01
• @Danu Done :))) Commented Nov 16, 2014 at 2:41