While my kids were still in schools, the kitchens began preparing real, fresh foods for the cafeterias. While they weren't gourmet meals, they were appealing enough to make a dent in the junk food purchases (a pizza and a taco chain had stalls in the cafeteria). Observing which students were more likely to patron the pizza and taco stalls, I noticed the leaner kids, and even the "oddly dressed," loved the salad bar. It was most interesting to see, and very telling about what kids will go for.
The schools also eventually banned soda vending machines, replacing the products with bottled water, juices and sports drinks.