 In terms of, for example, sweet potatoes, you should eat the skin as well. In terms of white potatoes, peel the skin because there's a poison in the white potato skin that is harmful to you, so I would stay away from the potato skins. I know everybody loves potato skins, and I'm sure some people are upset that I mentioned this, but unfortunately it's a fact. There is a chemical in the peel of the white potatoes that actually is poisonous.