No, Coffee and Tea Aren’t Actually Dehydrating. Here’s Why

When you want to quench your thirst, you probably don't reach for a steaming cup of coffee or tea. But despite what you've heard, coffee and caffeinated tea are not dehydrating, experts say.

It's true that caffeine is a mild diuretic, which means that it causes your kidneys to flush extra sodium and water from the body through urine.