Good point, I would say this is something what is much more difficult to calculate. Maybe it can fall under urban / rural lifestyle.
What I see for example, that more religious and rural-style people tend to eat better.
But in general, eating habits can be an outcome of our choices - when we marry, where we live, what is our purpose in life, etc. This is related to a fact how men live before marriage and after. Have you seen this difference?