You’ve heard it a million times: “Drink eight glasses a day!” It’s been drilled into our heads since we were kids. But guess what? It’s not a real rule. That number was pulled from thin air, like a magician’s handkerchief.
One study from way back in 1945 suggested we need about 2.5 liters a day. But here’s the kicker: they forgot to mention that most of that water comes from your food. So if you eat a juicy apple, congrats, you just hydrated.
