both my ‘girls’ and ‘boys’ schools have anti junk rules for snack..
I must admit the girls school is more strict about it- they actually take the nash away snak may only be a PLAIN mezonos (no chocolate chip or sprinkle cookies- thats for shabos party) and fruit or veggies..
If the boys want to take have something unacceptable I remind them of the note the school sent home…it usually works.
On the whole I dont bring it in the house