^I think it may have something to do with how the space on your plate is used. If you take only a couple of items…and small portions of it…it may make your plate look near empty. Instead…you put small portions of MANY things in your plate…so that the plate looks more filled up. It may give the illusion of you eating a fuller meal. And then eat slowly. If you get done with your food before your friends and just sit there with an empty plate…it could look like you never took that much food to begin with.