It took three years to solve the problem.
Another boy threatened my son in the cafeteria on the first day of first grade. This was observed by school personnel, who prevented it from ever happening again, and my son’s teacher repeatedly reassured him that it would not happen again. In fact, within a few weeks, he and the boy who had threatened him became friends. I really don’t see anything more that the school could have done that they did not do. Nevertheless, my son could not choke down any food in the cafeteria until fourth grade.
I would have lost my mind if I had had to cope with a desperately hungry child between school dismissal and dinnertime every school day for three years. I came pretty close to losing it when I did it for three weeks.