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Does coffee dehydrate your kidneys?

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.

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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. If you’re peeing frequently, and thus losing lots of liquid, it’s logical to think you could become dehydrated — but it actually doesn’t work that way, explains Dr. Daniel Vigil, an associate clinical professor of family medicine at the David Geffen School of Medicine at the University of California Los Angeles. Get our Health Newsletter. Sign up to receive the latest health and science news, plus answers to wellness questions and expert tips. Please enter a valid email address. * The request timed out and you did not successfully sign up. Please attempt to sign up again. Sign Up Now An unexpected error has occurred with your sign up. Please try again later. Check here if you would like to receive subscription offers and other promotions via email from TIME group companies. You can unsubscribe at any time. By signing up you are agreeing to our Terms of Service and Privacy Policy Thank you! For your security, we've sent a confirmation email to the address you entered. Click the link to confirm your subscription and begin receiving our newsletters. If you don't get the confirmation within 10 minutes, please check your spam folder. “When you drink a cup of coffee or you drink a glass of iced tea, you are necessarily taking in a volume of fluid along with that dose of [caffeine],” Vigil says. Even though caffeine is a mild diuretic, Vigil says, you won’t lose more fluid through urine than you take in by drinking a caffeinated beverage. Your body is able to absorb as much fluid as it needs and expel the rest, he says. For that reason, your morning pick-me-up actually helps hydrate you, not the opposite. Vigil says that coffee and tea “can and should” count toward your daily eight-or-so cups of water per day. And if you find yourself with headaches or other symptoms after your morning java, Vigil says dehydration likely is not the culprit. You may just be sensitive to caffeine — or dehydrated for reasons that have nothing to do with your coffee or tea habit.

Write to Jamie Ducharme at jamie.ducharme@time.com.

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Does coffee cleanse the kidneys?

Caffeine increases your heart rate and expands your blood vessel diameter, and it regulates blood flow throughout your body. As a result of the increase in blood flow, the toxins and metabolites are filtered out of your blood through your kidneys faster.

Does coffee affect kidney health?

You've read all of the health benefits of black coffee and how it can help you lose weight, how coffee grounds are good for your skin, and that it can even help you live longer. But what about inside your body? There have been articles stating that coffee can be bad for you, especially your kidneys, and we're here to challenge that theory. Facts have shown that drinking around 3-4 cups of coffee a day can actually help your kidneys and does not lead to Kidney Disease. Additionally, a recent study from last year suggests that caffeine can help people with chronic kidney disease live longer. Caffeine increases your heart rate and expands your blood vessel diameter, and it regulates blood flow throughout your body. As a result of the increase in blood flow, the toxins and metabolites are filtered out of your blood through your kidneys faster. Overall, caffeine can only help your kidneys do their job a little faster than normal. As always, if you're concerned about how coffee can affect your health, talk to your doctor!

Related: Here's why coffee is actually good for you

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