Water Intake: How Much Do You Need

Edaku — Sat, 18 Oct 2025 09:00:00 +0300

“Drink more water” is one of those pieces of advice that gets repeated so often nobody stops to ask where the number comes from. Some people swear by eight glasses a day, others by two liters, others insist you should just drink whenever you feel thirsty. So where does the guidance actually come from, and how much does it apply to you personally?

Where the “eight glasses” rule came from

The familiar rule of eight 8-ounce glasses — roughly 1.9 liters — isn’t a strict scientific threshold so much as a tidy, memorable number that stuck in popular culture. It happens to land in a reasonable ballpark for an average-sized, moderately active adult, which is probably why it spread so widely, but it was never meant to be a one-size-fits-all target. Actual fluid needs can differ quite a bit between individuals.

Water Intake on Edaku

Water Intake: How Much Do You Need

Where the “eight glasses” rule came from