It's frowned upon to overeat.
Joseph has been invited by his mother to eat at her house.
Joseph wants to serve himself.
Joseph serves himself a moderate amount of food in his plate.
Joseph serves himself and eats three servings of the food.
When Joseph's mother sees that there is a lot of food left over, she tells him to take some home.
Joseph's mother is upset that he ate so much food and doesn't invite him over again for a while.