If I may float a counter argument (that I personally don't happen to support but fully appreciate): As we move towards socialized medicine, your body becomes less "yours" and more part of the collective. If society pays for the results of how you use your body, it seems logical that they should have some say in that use.
That is one of the reasons I dislike socialized medicine. The state allows one and only one solution, so you have to get into it, whereas you can likely buy a little more expensive "fat" insurance and not have to change your body (or, just as likely fit people get a rebate).