Hello. There is no such thing as drinking on an empty stomach. However, drinking slimming tea is not good. First of all, going to the toilet for a long time will lead to dependence, pain before diarrhea, and eagerness to go to the toilet regardless of time. Any deeper will hurt your stomach. If you can stand the taste of slimming tea, why can't you insist on eating less and exercising more? If you haven't given birth to a baby, I suggest not to drink any more. Just a suggestion.