Grew up in the 1980-90s. I was one of those kids who took bagged lunch to school on some days and had hot school lunch on other days. I have nostalgia for school lunches from the '80s and '90s. Rectangular, soggy-bottomed pizza with congealed grease on top of the cheese. Steamed hot dog on a bun or corndogs that's always served with side dish of tater tots. Hamburger or cheeseburger notable for soggy steamed buns and packets of ketchup that came with it. Beef and cheese burrito served with side of bland corn bread. Sloppy Joe spaghetti that looked like something your cat vomited. Canned fruit jello desserts. List goes on. Of course the ritual of rolling back the foil to reveal the food you're about to eat, disgusting or not you're hungry so you looked forward to eating it anyways.
Then in high school n the '90s when we got our own cars, it wasn't any better. My high school was still serving unhealthy food but there were more choices, since we could order off the menu a la carte. People still ordered the same junk like cheese burgers though. Our high school cafeteria sold freshly made giant, soft chocolate chip cookies that were quite popular. We used to eat them with soft drinks we'd buy from multiple vending machines inside the campus. That was before they got taken out of schools. Even now the school lunches are crap but dressed up in healthier options. Still doesn't compare with other countries such as Japan where they cook lunches fresh from scratch using local ingredients in each school districts.