Thanks for the link to the article.
Fat should be political. All the factors that cause fat are, ahem, big issues.
The food industry, Western medicine, women's control over their own bodies, environmentalism, racial oppression, poverty, media, government regulation, education, values... on and on.
My cynical view is that in America, consumerism will win. People like sugar-fat-salt, so they will pay for it. Sugar-fat-salt providers will profit, and do everything in their power (e.g. lobbying) to continue to profit. People will eat more and gain weight. Then they will want accomodations -- bigger clothes, cars, chairs -- and, when people are willing to pay for those things, they will get them.
For example, look at clothing sizes -- a certain size today would have been a bigger number not too long ago. Americans have grown bigger, so we want to buy bigger clothes, so the marketplace provides bigger clothes.
Clothing size is the most visible change, but there are others. Have you noticed how newly constructed theaters and stadiums tend to have more spacious seats than older theaters and stadiums?
The more overweight Americans we have, the more money there is to be spent on accommodations for size. Businesses have already started meeting the demand for these accommodations. Soon accommodations for size will be widespread enough so that a business or government entity that does not have accommodations for size will not be able to compete. There will be pressure for every industry, every sevice provider, to accommodate size. Then our culture will change, because our culture tends to change depending on what people are willing to pay for.