Moral choice isn't really in vogue as a modern concept. Modern thought teaches us that only a few things (e.g., supporting George W. Bush) are truly culpable. Other afflictions, to speak broadly, are due to our genes or to the way our fathers/mothers/classmates/teachers treated us when we were young and vulnerable.
The villains of the food fight are fast-food companies like McDonald's and Kentucky Fried Chicken. Allegedly, because they sell all this stuff that ruins people's lives, they should be reined in.
Horsefeathers! To live is to choose. To choose a Big Mac with a 24-ounce Coke in preference to water and green salad is to live. Not, perhaps, to live as well or as long, but, then, the life of freedom is more than a series of boxes to be checked off on orders, or overbearing hints, from the government.
What the government's would-be enforcers propose is approximately what that quaint old institution, the family, used to provide: oversight, supervision, instruction in the particulars of life. It would be unfair to blame the obesity "epidemic" solely on the family's ongoing decline as arbiter of culture and standards. It is worth remembering anyway that, where and when the universe is properly ordered, Big Daddy outranks Big Brother.