In general they allow junk food stalls which are major attractions for children...but it should not be allowed, instead they can keep some health food or some calories conscious food ... :) :)
I am in favor keeping a strict vigil on school campuses not only on the quality foodstuff sold but on some other highly dangerous activities.I have heard that some people even sell drugs to students!
Many school don't allow the junk food to be eaten by kids in school. Junk food contains harmful fat for kids which can make them obese and in future lead to more dangerous ailments.