I saw a [url=http://onlinelibrary.wiley.com/doi/10.3322/caac.21237/full]paper[/url] on Reddit about this very thing, and the actual causes are very difficult to combat. People are getting fatter because food is more available; even if produce and "healthy" foods were more affordable, there's no evidence that consumers would substitute them for unhealthy food; and looking purely at obesity, eating healthy isn't going to solve the problem anyway, since it's about eating [i]less.[/i] Over time, we've built an environment that promotes massive production and consumption of foods. The suggested policies boil down to some really hardcore price controls that couldn't even pass in Denmark, and they have zero chance here in the States.