> the path of least resistance is very different in the US, Europe and Asia

My theory is that in US compared to Europe, you are going to need the path of least resistance more often. If you are working two part-time jobs with variable hours and schedules to make ends meet, then you are going to reach for the easy & fast food options. Whereas if you have the stability of 40 hour work weeks, regular schedule and social safety nets - regardless of the total income - then you have the time and mental energy to eat healthier.