The government dictating that I can only eat in a healthy manner at all times is one of the most dystopian things I can imagine. Many evils have been unleashed upon society with the justification that it is for the greater good.

You are expanding the scope of the original suggestion to make it seem more extreme. Taxing activities that damage society as a whole (and funneling that money towards mitigating that damage) seems to me like a good solution.

What about if the government made it illegal for food producers to use the worst offenders e:g adding high fructose corn syrup to food, giving cows growth hormones, spraying glyphosphate? So the consumer's freedom would be un-curtailed, but businesses have to abide by certain ethics. Does that make things work for you, or still no good? :). (I mean , maybe you should still be allowed to buy a bottle of corn syrup and add it yourself if you really really want to.. although perhaps parents shouldn't be allowed to feed their kids that).