There's an interesting question, there's no easy answer to that one and when you have a definition of something like unhealthy, economists always start to worry if we impose a regulation on unhealthy foods and we start trying to define unhealthy, are we starting down a slippery slope of regulating things that might be somewhat healthy and really intervening in people's lives in some heavy handed ways rather than just saying here's a list of absolutely unhealthy foods and we're done with it. 