What about food rejected by school children in their lunches? Even before Michelle got involved mandating what can and can not be provided for school lunches, schools threw out massive amounts of food each day.
Back in the '60s, we had a teacher at my grade school that would stand by the tray return and make sure each child had eaten at least three out of the four items on your plate. Otherwise, we would have to sit back down and eat more of our lunch. She was an older lady that had lived through the Depression, and remembered those days.