It's dubious to blame obesity on the free market. At the end of the day eating well and staying healthy is a personal responsibility. In most cities and towns there are just as many healthy options available as there are unhealthy options, and most of the time it's no more expensive (or even cheaper) to eat well than it is to buy junk. Fact of the matter is, a lot of people choose to eat poorly.

I strongly disagree with the concept that another person knows better than I do which food I should eat or how I should otherwise live my life.

That said, there should be more education around nutrition. Even free healthy food doesn't help anything if people are too dumb to choose it over junk.