The school lunch argument is neither here nor there, but needing a 3,000 calorie per day diet doesn't mean to get most of those calories at lunch. Lunch, in fact, is supposed
to be the lightest meal of the day. Properly raised kids will get the rest of the calories they need for breakfast or lunch.
Anyway, I've got no disagreement with using "corporal punishment" on grade-school aged kids up to maybe 4th grade. But such punishment on a teenager is meaningless and stupid.