In the 1940's there were a number of children in the little one room school I attended who truly lived in abject poverty. I can remember kids who, when food ran short brought lard sandwiches for lunch and, on more than a few occasions, when food had run out entirely, youngsters who claimed to have "forgotten their lunch." I pray to God that we will never see a return to those days.
On the other hand, years later after moving to a much more prosperous section of the country, I can also remember the numerous times my friends and I would skip school lunch entirely in order to spend the 25 cents on paper back books and model airplane kits. It was a question of priority - some days we were hungry and some days, the choice between institutional food and the latest scribbling by Andre Norton was easy.
I'm all; for making nutritious school lunches available to youngsters. What I am not in favor of is anyone, the school, the state or the feds forcing them to eat only the meal the school provides. If the kid wants to eat peanut butter sandwiches and only peanut butter sandwiches, parent agreeing, that should be his prerogative despite all the over-hyped garbage about this or that supposed allergy to the contrary.