Diabetic beware

I tried it with my friend and didn't like much it has a sharp flavor. My friend is a diabetic person and she bought this because it says 10 calories and 1g sugar in 250ml means a quarter teaspoon sugar in a cup it was like wow because she was eating canned fruits with no added sugar which have more sugar and calories than this product. Her sugar level was under control and this was the only thing she added and replaced that canned fruit. Her blood sugar level shoot like crazy. It has erythritol instead of sucrose or fructose, May be that had to do with this situation. But I would suggest diabetic or trying to shed weight? Do not buy that 10 calories and 1g sugar story this product is only for them who doesn't care about sugary products and calories.