So this is either:
A) A line of yoghurt which has multiple levels of sugar in it, the idea being that you can switch between them to try and ween yourself off sugar.
B) A food additive that blocks sweetness. So it’s masking it, meaning you get all the badness of sugar, but not the taste. However the idea is that you could add this to the foods you already eat, and eventually switch to a different brand with lower sugar after you’ve weened yourself off.