I find that black teas make me sick on an empty stomach, but whites, greens. oolongs don't. Earl Gray on an empty stomach will always make me vomit. I find any sweetener ruins the subtle taste of whites for me but I have weak taste buds I think, darker oolongs I like a little sugar with, and I always drink blacks with honey and a drop of cream, I guess what I'm getting at is I try tea every way to find what I like the most and don't let "tea snobs" tell me how I should enjoy it. That being said I always try tea straight first then experiment.