"Mm - it means that people won't try to feed you. Well, most of them, it depends. Leaflets like me have a decent shot at vassaling another fairy with food because of how strong the claims on our tree are. But while that would be less likely you'd also look more useful. As a mortal you're a temporary curiosity until you do magic and look really interesting; as a weird foreign fairy you're potentially very valuable and could be kept permanently."