Keep in mind that unlike in Europe in the US processed food is often cheaper than fresh vegetables, fruits and meats. I always thought the US would be "cheap" in terms of consumer prices compared to western europe but it was significantly more expensive to buy fresh produce in US supermarkets than in Germany or Austria.
On the other hand stuff like coca cola is cheaper.
$1 “any size” soda at McDonald’s up to 40oz where I live, with free refills. Most everyone I know spent a good amount of their teen and early adulthoods surviving off of cheap food - fast food is incredibly convenient and as cheap as a healthy “struggle” meal of staples without a long time in a kitchen which you may not really have.
But you can also be so poor that you can afford calories, alcohol and little more as an entertainment. It's easy to get obese then.