Missing from an otherwise solid satire is the role played by Corn Syrup in the obesity epidemic.
Sugar and corn syrup were not always components of things like pastas and basic cereal products. Now they are added to everything!
Coke is hardly the only culprit (although the stuff takes like poison to me). During my last year of college I worked as a Howard Johnson waitress and I actually contemplated NOT serving ice cream sundaes (typically along with, get this, "Diet coke") to very fat people since in my own mind I considered the "act" that of being an "accessory to a crime."
Living in the Deep South I see tremendous numbers of morbidly obese people. This kind of fat is not found in NYC or L.A. to such pervasive extents.
I think the idea of baking cakes to celebrate church picnics and family occasions is a HUGE factor. A lot of these church-going women take probably their only joy and pleasure from baking cakes for after church get-togethers. They get lots of "strokes" from the congregation and the weight matter is not discussed. Therefore, being quite fat becomes socially acceptable rather than viewed as unhealthy.
I also have noticed that obesity is starting MUCH younger and when kids get the "fatty" stigma from grade school, only the most self-disciplined and brave typically finds their way back to a svelte body. The stigma can hold (and sting) for life.