It can, but you have to go wildly out of the norm for this to be so. Like, I have serious kidney issues, and I hate plain water. My nephrologist said me drinking 1-3 gallons of iced, and hot, tea per day is fine. The only time it becomes an issue is when you have have extremely concentrated black tea. Even then you would have to be drinking a lot of it, like a lot. He cautioned on tea mixes because those can add sodium, and of course not to use sugar, but that it would be little different than drinking water otherwise.