Did you know that older varieties of apples are better for you than new? Old varieties contain more valuable dietary fibers such as cellulose or pectin and important vitamins and polyphenols. Varieties that are in the older category include Granny Smith, and Red and Golden Delicious.
More importantly this idea does not just apply to apples but also to other groups of foods such as corn. Check out this article from 2013 in the New York Times below to learn more.