Medical schools almost completely ignore the topic. Biomedical funding agencies mostly give it a pass, at best dedicating only a small percentage of their funding for nutrition research. The public therefore must fend for itself when trying to understand which nutrition information is correct and which is not.
Saying "it's your decision" is abdicating government's responsibility to protect us. It's declaring that the chemical industry is in charge, that our only chance for protection is for each and every one of us to become toxicologists and assess risk in our tap water, in the beauty aisle, at the supermarket.
Privilege is ultimately front and center here. Mr. Cisna could have stopped his fast-food diet at any point. Many Americans, however, are beholden to unhealthy eating out of necessity. We owe it to them to help build a healthier food system, rather than hold up fast-food chains as beacons of health while simultaneously chastising individuals for making "bad choices."