Question

A common health myth is that people should drink at least eight glasses of water per day. While staying hydrated is important, why could this advice be inaccurate for different people? (Site 1)

Answer 1

Some people have different body weight so there is a thing called drinking way too much water compatible for your body weight.

Answer 2

Some people are more active than others and the more active you are the more water you use by sweating.