Why dont koreans feed thier kids?

Maybe it is just my school, but all my students are always hungry. They constantly beg, whine and cry for food and candy, whether I have it or not. Every time they see me with food, if they can not say

"Teacher I hungry, please give!"

They open their mouths as wide as possible and motion emphatically for me to feed them like baby birds harassing a mother bird.

The clownish begging is one things, but some of my kids are so hungry that I have witnessed them eating the leavings of other students off the floor of my classroom. Its really embarrassing to see my students degrade themselves like that.