Btw calorically dense foods are, in fact, hyper nutritious. While you may imagine healthy foods to be green vegetables and raw meats, you can buy - from regular supermarkets - roast chickens ready to eat, salad bowls and fresh fruit. You need not even store it, but buy and eat on the go.

People repeat the myth that healthy food choices are expensive (they aren't) and time & space consuming to make (they can be) so often that most people believe it. But it just isn't so: you can eat at McDonalds every day, and if it's only a part of your diet, it's healthy. If you can get fibre and some vitamins elsewhere, and aren't overeating, the protein and calories in a fries and a hamburger are fine. Good, actually.

Healthy foods are simply principally marketed to, sold at a large markup to, middle to upper class Americans so they believe that's the usual market value.

Now, it can be expensive in time, effort and equipment for struggling, hard working, irregular shift workers. That's a different issue though.

You are correct, but regular supermarkets can even be scarce or non-existent in many areas.