What Does Research Say About the Cultural Prescription to Drink

What does research say about the cultural prescription to drink 8 glasses of water each day?

A) Adults should drink 8 glasses, while children should drink 6 glasses per day.
B) No evidence exists to support this advice.
C) People who drink 8 glasses per day will become healthier than will people who do not drink 8 glasses per day.
D) People who drink 8 glasses of water per day will speed up their metabolism and lose weight faster.