If people were free to choose health but instead kept poisoning themselves so much that they had to elect a health czar to fix things for them like an authoritarian, it means that individual freedom doesn't work. It always come back to authoritarianism.
Discussion
Your assumption is that everyone is unhealthy but that's not true, we want a public official who cares about health because we want to set a HIGHER standard for health than already exists. If you have public officials who conspire to poison people who are already irresponsible and unhealthy, that is a recipe for disaster. It's not authoritarian to criminalize poisons that are being sold as food, that is humanitarian.