Like "Tea doesn't generally have that immediate an effect on blood sugar levels, unless you combine it with sugar or some other form of natural or atificial sweetener. In the case of most sweeteners, your blood glucose levels are more likely to rise than to go down. About the only reason I could think of that tea would make your blood glucose levels drop is if you are drinking a large amount of caffeinated tea. That may speed-up your metabolism on a short-term basis. On a long term basis caffeine, as a stimulant, can cause weight loss, which might also cause your blood sugar levels to drop over time. Obviously, there are side-effects to taking stimulants regularly though."