I went to a traditional English boarding school from the age of about 11 to 17. When I was 16 they switched the dining hall from the full-on Harry Potter long

I went to a traditional English boarding school from the age of about 11 to 17. When I was 16 they switched the dining hall from the full-on Harry Potter long tables and served food (served by students) to a cafeteria style. At the same time they changed catering managers and the new one wanted to improve food quality and get the pupils eating better. What he did was really simple: he added a self-serve salad bar with as many refills as you liked. What ended up happening was hulking great rugby players would collect their hot food, and then go to the salad bar and add vast piles of salad. Then they would frequently go back for more. I forget whether there were salad dressings or not. He may not even have reduced the portion sizes for the cooked food --- active children of that age use vast amounts of energy. So the end result was that without any kind of pressure or active encouragement, he managed to get complete generations of children to train themselves to like salad.