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Yes, I have seen some studies that link green tea to a higher glucose absorption rate, of course, that means that green tea increases insulin sensitivity, which is a good thing.
Yes, it is a carb-block for SOME carbs, not all--just as white kidney bean extract--, while w/ other carbs it increases the rate of intermuscular glucose uptake, while decreasing the uptake of glucose by the fat-cells.
Mr.X