If you are a mother who periodically finds half a peanut butter sandwich, the bottom of a cupcake or a partially eaten cookie left by a child whose eyes were bigger than their stomach, there is a solution other than the "momism" about starving children in Africa (China, Bangladesh, Uganda ...). In a friend's house, the scraps are deposited in a large, covered, plastic container labeled, "good-will can".
Making soup from leftover scraps can be surprisingly good. Use up your leftovers, and freeze your vegetable scraps to make a low cost nutritious soup.