Jayne T (London, Uk) on 05/27/2014:

The black tea settled my stomach really quickly. Usually when I have a bad stomach like this I feel ill for days afterwards and have several episodes of diarrhea. But after the black tea I felt no ill effects, I just felt normal like I was well.

I avoided eating much the next day to be on the safe side, but felt completely fine. Apparently black tea works for diarrhea because it contains tannins which are binding.