We neeeeed our caffeine, but have always been told that tea, coffee, and other caffeinated drinks don’t count when it comes to getting hydrated. The common belief is that they are diuretics (meaning that they promote urination) so they must be dehydrating. But it's not that straightforward!
Most of the research studies on the subject consists of giving people high doses of pure caffeine mixed with water, not exactly the way people usually consume caffeine in daily life. According to the Mayo Clinic, downing 500mg of caffeine or more in a day could put you at risk for dehydration, but that’s the equivalent of 20 cups of matcha!
One of the rare studies asking participants to drink tea found that there was no difference in hydration levels between people who drank tea and the control group who drank the same amount of boiled water. Other studies using coffee instead of tea have had similar findings.
In our review of the topic, we learned that there’s no question caffeine itself is a diuretic, but the water in tea more than makes up for the de-hydrating effects of caffeine. You don’t need to force yourself to drink 8 glasses of plain, boring water to be hydrated – switch things up with matcha :)