Apple skin does have its nutritional value, just if the cleaning is not clean it becomes poison.

The skin of the apple itself has antioxidant properties, and it is not hairy and can be eaten directly. Although the apple skin does have nutritional value, but in the consumption of time also have to clean or else it will become edible poison; now in order to better preserve the apple basically will use pesticides to plant, the transportation process will be added inside the preservatives to protect the apple shape, so in the non-peeled food must be cleaned up the appearance of the apple can be, or else it will be poisoned to eat with.