Although they can be eaten as soon as they are harvested , for storage and preservation purposes they'll need about a week to cure.
Curing improves the flavor by converting some of the potatoes starches to sugars. It also increases the storage life and reduces loss from decay.
Sweet potatoes are high in antioxidants and carbohydrate rich. Sweet potatoes with the skins still on them, are a high fiber culinary delight, they also have a high vitamin content - vitamins A and C, as well as manganese.
An average-sized sweet potato is only 100 calories, thats of course before you put the toppings such as butter on them.