I think that if you introduced a tax like this, food producers would be more adept at reading the rules and determining what is "added". They could also simple

I think that if you introduced a tax like this, food producers would be more adept at reading the rules and determining what is "added". They could also simple start substituting in artificial sweeteners or the like to maintain some of the taste. There are people who thing that aspartame or other zero-calorie sweeteners are worse than sugar.