For most of my lifetime I've heard that you should drink 8 glasses of water a day. We were told it keeps a body healthy and hydrated, but now, health experts say that is a myth and that people should should simply drink when they’re thirsty, instead.

Madelyn Fernstrom the diet and nutrition editor for the ‘Today’ show, says the eight glass rule is no longer the recommendation. Instead, people should “drink to thirst.” It's recognized that we take in a lot of fluid through other means and just drinking water for the sake of drinking it, probably doesn't make sense.

It was the Food and Nutrition Board of the National Research Council which made the original guidelines in 1940, in which they proposed that adults should consume approximately 64 ounces of water a day.