It's a piece of doctorly advice you have probably heard dozens of times: "Drink plenty of fluids." But have you ever wondered what it actually means? How much is "plenty," what kinds of "fluids" are ...

It’s a piece of doctorly advice you have probably heard dozens of times: “Drink plenty of fluids.” But have you ever wondered what it actually means? How much is “plenty,” what kinds of “fluids” are ...