can tea dehydrate you

can tea dehydrate you

Can Tea Dehydrate You?

Tea is one of the most popular beverages in the world, but can it also cause dehydration? Tea is made with water, so it would seem like it should help keep us hydrated.

However, thanks to certain compounds found in tea, there is some evidence to suggest that tea can actually cause mild dehydration.

Does Tea Contain Caffeine?

One of the main compounds in tea that can cause dehydration is caffeine. Caffeine is a diuretic, which means that it increases urination. This can lead to the body getting rid of more water than it is taking in, which can lead to dehydration.

Are There Any Other Compounds in Tea That Can Cause Dehydration?

In addition to caffeine, tea also contains tannins. Tannins are compounds that can bind to proteins and reduce their function. One of the proteins that tannins can bind to is aquaporin, which is a protein that helps regulate the amount of water in the body. When tannins bind to aquaporin, it reduces its function and can lead to dehydration.

What Kinds of Tea Are Likely to Be Dehydrating?

Any tea that has a high level of caffeine or tannins is likely to be dehydrating. This includes:

  • Black tea: Black tea has the highest levels of caffeine and tannins, so it is the most likely to cause dehydration.
  • Green tea: Green tea has a moderate level of caffeine and tannins, so it is somewhat dehydrating.
  • White tea: White tea has the lowest level of caffeine and tannins, so it is the least likely to cause dehydration.

How to Avoid Dehydration From Tea

If you are concerned about dehydration from tea, there are a few things you can do.

  • Drink plenty of water: One of the best ways to ensure you’re staying hydrated is to make sure you’re drinking enough water throughout the day. If you’re drinking tea, make sure to have a glass of water before and after.
  • Limit caffeine: Try limiting your intake of caffeinated beverages, especially if you’re sensitive to the effects of caffeine. There are also many caffeine-free teas available.
  • Don’t over-brew: Over-brewing tea can increase the amount of tannins, so make sure to follow the steeping instructions for your tea.


Tea can be a great way to stay hydrated, but it can also cause mild dehydration if it contains too much caffeine and tannins. To avoid dehydration from tea, make sure to drink plenty of water, limit your caffeine intake, and don’t over-brew.


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