Illustration by Bob Al-Greene

Staying hydrated is especially important during warmer months, but how much water do we really need? A good starting point is 1.5 liters per day plus an additional liter for every hour of strenuous exercise or activity (and slightly more if you’re working out in the heat!). The almost foolproof hydration check? The proof is in the pee. Clear or pale urine is good. If it’s darker, keep drinking! (Water — not alcohol.)

The Takeaway: Stay hydrated by drinking at least 1.5 liters of water per day.

Drink Water for a Headache Cure

It turns out many headaches — including some migraines — can be avoided by keeping on top of fluids.

Do I Really Need Electrolytes?

Get the low down on fueling up post-exercise.