Yeah it makes my teeth chatter, it’s very strange. I didn’t noticed a big difference between full vs. empty stomach but I wasn’t paying much attention to that either.

I will say that most types of tea do this to me, to varying degrees. Black teas are the worst, green tea isn’t nearly as bad. I’ve had some Chinese white teas and I barely noticed any jitteriness, but those teas really aren’t very strong to begin with.