alt Hacker Newsit's great to recommend these things but if you're poor and live in a food desert, it doesn't address the actual issues that prevent people from eating healthier: money, living in an area where the bodega or wal-mart are your only food options, corporate interests that want us to eat ultra-processed foods, not having the time or ability to cook, and many more I'm sure.
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I was roaming around the rural Western US last year.
If I saw that there was a Walmart in town, I perked up. Consistent, low-priced and large number of grocery items. Likely better than an unknown, variable, often poorly stocked local grocery (or worse, groceries at a gas station/convenience store).
I also liked seeing the economic diversity of customers that I wouldn't see at home.
In larger cities, I'll choose other groceries if I can for better selection, if not better prices.
Of course, except for maybe Sprouts, all the places I shop emphasize ultra-processed corporte interests.
Even questionable quality ground beef is almost always a better option than most carb-centric nutrition sources. It freezes well, transports is broadly available and can usually be ordered for delivery.
Eggs, aside from some of the disease issues are also a very good, nutritionally complete source of protein that are relatively inexpensive.
Another issue is that people have been conditioned to eat/snack all the time... a lot of people have moved towards 2-3 meals a day which is closer to historical norms... have protein be your main source, with vegetables as a side, and maybe bread/pasta at some meals.
There are also beans/legumes if you can tolerate them.