I remembered when I was little, wastage of food was a no-no, esp having Dinner with dad. He would tell us that a grain of rice costs 5sen, a quarter of a milo glass (unfinished) costs 20sen etc.
He would remind us Siblings to remember his background, a poor farmer's son adopted by a European priest who sent him off to school at the age of 12. His parents were to poor to sent him to one. Those time, to have a piece of chicken thigh for dinner was luxury, which had to be shared with 12 other siblings of his.