Because potatoes are eaten so frequently they are very significant nutritionally. Potatoes are a good source of vitamin C, potassium and fibre and contain some magnesium. They are high in starch so will stop you feeling hungry for a long time. There is a special fibre in potato skin that helps to protect against some cancers, so to get the most goodness from your potato, leave the skin on. Potatoes contain anti-oxidants which research shows are able to inhibit the development of some cancers. In addition to this, anti-oxidants also decrease your risk of heart disease. Potatoes are not fattening, however some cooking and preparation methods are! Sometimes potatoes have had a pretty bad reputation for being fattening, but it isn't the potatoes fault, it is what we do to it.