From the view of an individual with self control you're correct. From a societal view that doesn't help. A large percentage of the population has demonstrated a lack of self control in this area. This has lead to widespread health problems. Those problems are a burden on society. Simply saying it's your responsibility deal with it won't reduce that burden.

We found a similar problem with smoking. Numbers of smokers have reduced with public education plans and limitations on marketing. Perhaps there are similar things that can be done to help reduce the number of people suffering obesity related illness. Perhaps it's something that will have a net positive impact on society as a whole?

There is of course a balance interfering with individual dietary choices is a slippery slop, freedom must be preserved at all cost.