Long answer: It doesn't matter what fruit it is - apple, papaya,
orange, whatever it is - the essential fact is that every fruit
contains vitamins which are required for normal growth and maintenance
of body, and fibers which prevent constipation and some cancers. At
least one fruit is required with each major meal in the healthy diet.
It can be apple, or any other fruit for that matter.
Source of this information:
http://nutrition-health.tripod.com/html/faqs/faq02.htm