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.
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Even if we ignore the siblings: but what is being selected for? Pure economic value, right? In other words, imagine two choices: a cheap meal that takes X time and Y money to prepare and eat, vs. a nutritious meal that takes X+n1 time and Y+n2 money to prepare and eat.
If the "fitness function" of the system is "produces more economic value" then it will select for (encourage) the first option because health and enjoyment of the consumer aren't being selected for. They are second-order effects at best, like pollution and other externalities.
I'm reminded of the RFK speech (the dead one, not the death-adjacent Jr.):
"Yet the gross national product does not allow for the health of our children, the quality of their education or the joy of their play. It does not include the beauty of our poetry or the strength of our marriages, the intelligence of our public debate or the integrity of our public officials. It measures neither our wit nor our courage, neither our wisdom nor our learning, neither our compassion nor our devotion to our country, it measures everything in short, except that which makes life worthwhile."
> If the "fitness function" of the system is "produces more economic value" then it will select for (encourage) the first option because health and enjoyment of the consumer aren't being selected for.
(Re-reading this, the part I glossed over is that choosing the cheap/quick meal leaves more time for "work")
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.
>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?
Sort of. To add to what the other replies had to say, the US government subsidizes different things. That's why even basic ingredients may have high fructose corn syrup in it. Be it as a primary ingredient, or to try and dillute the actual ingredient you want in that particular piece of food.
and since it's subsidized, these can be cheaper to eat here than to get some good fruits and veggies.