We need to reorient our cultural attitude about obesity so it is not an excuse to argue the respective merits of personal responsibility and public policy. Rather, if we are to fix it at its origins, we need to acknowledge that people who are empowered are most capable, and most inclined, to exercise responsibility.
Fortified junk food is still junk food. It isn't only what a food doesn't contain (i.e., those nutrients) that makes it dubious. It's what it does contain. The addition of vitamins and minerals does nothing to exonerate junk foods of their standard provisions of added sugars, added salt, artificial flavorings, artificial colorings, inflammatory fats, high glycemic starches, and willfully irresistible calories.
I'm working through this, but it's hard. I'm that "heavy user" of products that has Pavlovian cravings when I see an ad. I'm the person who can't get enough of the intoxicating combination of the salt-rush, the mouthfeel of fat, the neurological jackpot effect of sugar. But: the other day, I drank a cup of coffee without adding milk or sugar to it for the first time in a long time. It's a start.