Add forced sedentarism into that set.

This is not exclusive to the US. The world is trending towards those, and different countries seem to only be at different distances from it, but the same velocity.

Also, industrialized food seems to be much more effective in causing dependency. Food preparation has overwhelmingly shifted into less healthy alternatives (even when they sound healthier in a naive review)... And there's a multitude of low probability high impact possible contributors that nobody knows if are important or not.