I believe that most of the best nutrients of a fruit are in it's skin (which is why I have chosen to buy this juicer rather than just eat the raw fruit and veg). Your manual gives very little guidance as to which fruits can be used without pealing first and which have to be pealed. Could you at least tell me if Kiwis, Pineapple and oranges can be used with their peal still in tact? Regards Mrs. Matthews