Just to enumerate a few of the sides of this problem:
- economics. Junk food is more available because processed foods last longer and can be stored at mini marts and gas stations. It is true that beans and rice are cheaper than junk food, but junk food is a very cheap way for a dopamine hit.
- time: people have less time to cook due to working and commuting
- urban planning: walkable neighborhoods are few in the US. Lots of daily exercise is foregone for this simple reason.
- culture: the US has a very pleasure-seeking culture. Given the choice of having healthy food vs gratifying food, we tend to the latter.
All of these factors conspire to get us where we are.
- economics. Junk food is more available because processed foods last longer and can be stored at mini marts and gas stations. It is true that beans and rice are cheaper than junk food, but junk food is a very cheap way for a dopamine hit.
- time: people have less time to cook due to working and commuting
- urban planning: walkable neighborhoods are few in the US. Lots of daily exercise is foregone for this simple reason.
- culture: the US has a very pleasure-seeking culture. Given the choice of having healthy food vs gratifying food, we tend to the latter.
All of these factors conspire to get us where we are.