To be fair
Sugar does all these things, in fact carbonized sugar is incredibly carcinogenic.
The problem is the amounts being added to food is so high that it becomes a cumulative toxin, manufacturers who try to reduce both it and artificial replacements end up going out of business shortly thereafter.
Artificial-but-natural sweeteners such as Stevia (steviorgestrol) are a lot less bad, in fact Red Bull are looking into using it for a new "green" lower sugar version of the famous energy drink.
Maybe the Government should heavily tax unhealthy levels of both sugar and chemical sweeteners, based on current research?