If there is one health myth that will not die, it is this: You should drink eight glasses of water a day. It's just not true. There is no science behind it. And yet every summer we are inundated with news media reports warning that dehydration is dangerous and also ubiquitous.
These reports work up a fear that otherwise healthy adults and children are walking around dehydrated, even that dehydration has reached epidemic proportions. This article puts these claims under scrutiny.