To emphasize, I do not actually believe that assortative mating is the cause of the obesity epidemic.
A major challenge to any theory, however, is that it has to operate as a multiplier. The heritability of obesity is seemingly constant. That is, what we mean when we say “Whatever is happening, its seems to be happening to all of us”
If that were not true then presumably some people would be protected not only by their genes but by their environment. In which case heritability would fall.
For example, suppose that it is fast food. Well some people may be adopted into families which don’t eat fast food. This person should have a large degree of protection that is not genetic. Yet, the data don’t bear that out. Environment has not become more important.
Suppose it was watching TV, or drinking Soda, or any of those things. Then some sort…
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Utopia, you are standing in it! 
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