[fanboy123]

While all of that is true I think the real story is one of economics.

It is VERY easy for me to eat as much swine as I feel like nowadays. If we assume that saturated fat/protein isn't bad for you then the fact that I can, in modern times, acquire the pig with less effort than my ancestors doesn't appear to harm me very much. It is tasty pretty much right out of the farm. I imagine it is difficult to make the margins on livestock very high.

Carbs have brands. They have business moats. They have high margins and great psychological keys that make selling them a great business (helps to be addictive). So they push and we buy.

Anyways my thought was that the obesity epidemic has less to do with how we are more sedentary than before but rather the peddlers of PROFITABLE products just got better at their jobs over time.