School lunches where I live we don't have school lunches, it's bring your own. that was in the 50s and early 60s.
There were about 200 kids in the elementary school my grand kids went to.
Nobody was allowed to bring peanut butter sandwiches or any form of peanuts because ONE child had a peanut allergy.

Never heard of such a thing when my kids went to school in the 70s and 80s.