Does Coffee Cause Dehydration?


Caffeine is a diuretic, which has a dehydrating effect. Which in turn means that with every cup of coffee you drink, your kidney will begin to produce more urine output than normal.

Dehydration occurs when you use or lose more fluid than you take in, and your body doesn’t have enough water and other fluids to carry out its normal functions. If you don’t replace lost fluids, you will get dehydrated.

Which is why I like to have a glass of room temperature water first thing in the morning before my coffee.

Does Coffee Dehydrate You?

Caffeine increases fluid loss through urination, thus results in a form of dehydration.

Although caffeine itself can cause dehydration, the additional water in your coffee helps offset the mild diuretic effect of caffeine. So in a way the water balances it out and I wouldn’t be too concerned about dehydrating from drinking coffee.

However, when you deplete your body of fluids by sweating or using the restroom too often, you run into that risk and you may want to have that cup of water or even better, something that contains electrolytes to help maintain homeostasis and fluid balance.

A recent study looked at urine volumes produced in the 2 hours after drinking a range of drinks; the fluid loss from coffee was highest.

Symptoms of Dehydration Can Include:

  • feeling thirsty.
  • dark yellow and strong-smelling pee.
  • feeling dizzy or lightheaded.
  • feeling tired.
  • a dry mouth, lips and eyes.
  • peeing little, and fewer than 4 times a day.

Final Thoughts

Now that you know that caffeine is a mild diuretic and can make your kidneys produce more urine and make you go number 1 more than normal, you can off set it by doing what people having been saying for years and that’s to make sure you drink plenty of water throughout the day.


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