Your friend who lives in Arizona and runs marathons needs triple the water of me, a desk-hugger who walks to the fridge. Age, weight, activity level, even the weather matters. The National Academies suggest roughly 3.7 liters for men and 2.7 liters for women daily—but that’s from all sources, including coffee, tea, and that sneaky celery stick.
(Side note: coffee does not dehydrate you. That myth is as dead as your 2016 Fitbit. It’s a mild diuretic, sure, but it still counts toward your fluid total. Enjoy your latte guilt-free.)
What about “thirst is already too late”?
You’ve heard that one, right? Some expert says if you’re thirsty, you’re already dehydrated. Okay, hilarious—because evolution gave you a thirst mechanism that works like a smoke alarm. It’s not perfect, but it’s not broken. If you’re thirsty, drink. If you’re not, don’t stress. Your kidneys are literal geniuses at balancing things.
Unless you’re a frail older adult or an ultra-endurance athlete, you can trust your brain. Your body has been doing this water regulation gig for millions of years. Respect the algorithm.
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