What do you pee out if drink too much coffee?

Here's why:

* Caffeine is a diuretic: This means it makes your body produce more urine.

* Coffee is mostly water: Even though it has caffeine, coffee is mostly made up of water.

While you might lose some electrolytes (like potassium) when you drink a lot of coffee, the main thing you're peeing out is the excess water you've consumed.