I'll focus just on food here: people do have a choice. I don't live in the US but is it impossible to buy basic ingredients, fruit, vegetables, grains, meat whatever etc., and actually cook something? Eating this kind of food you can even stack your life chances more in your favor. Huge amounts of information abound as to the how you can do that. Consumers, if they are free to choose, determine value and entrepreneurs will respond. It can be profoundly distorted, that's true but at base, capitalism is doing something that someone else finds of value or not.

The basic ingredients are also lower quality and less nutritious. For example, vegetables and fruits these days (at least for the U.S. market) are grown almost entirely for size and appearance, not for the amount of trace nutrients they contain or other quality measures.

Sibling comment is correct, also in the US we have "Food Deserts"[1]: lower income areas that lack typical grocery stores, and might only have convenience stores that only stock prepackaged or processed foods. Any raw ingredients available are expensive and/or low-quality.

1: https://en.wikipedia.org/wiki/Food_desert