I am thinking of decent clean fresh fruit and veg. Nothing fancy. It's not easy to find.
Most restaurant food is relatively unhealthy - everywhere except Greece etc
When I was doing the IR in the USA (Phoenix) I cycled to a supermarket and bought a load of lettuce and tomatoes etc and made my own sandwiches for the day. All the food in restaurants there was stodgy crap. When I was on holidays there 20 years ago I used to gain a few kg in 3 weeks, just eating the hotel stuff. This is what I don't get about America; they are not stupid or poor but they drive themselves into an early grave by eating this stuff.