In China you can get tea for everything from relaxing fruity tasty stuff to medicinal tea. I had a really bad gut problem and was given some curly, really nasty bitter sage tasting leaves that unfurled when boiling water was poured over them. But woah this fixed my problem. I was sick a couple of times but the bad guts (shits) stopped that very day!! ha ha.
I did noticed the taxi drivers there had large containers full of tea which they constantly sipped during the ride and had it explained to me that they were completely addicted to the tea to the extent that their teeth were almost completely black. Everything in moderation I guess!
S.