More from KUOW Health Why Does Your Gut Bacteria Love Granny Smith? KUOW | By Marcie Sillman Published October 17, 2014 at 12:51 PM AKDT Twitter LinkedIn Email Listen • 2:17 Flicker Photo/Deborah Fitchett (CC-BY-NC-ND) What's the truth behind "an apple a day"? Marcie Sillman speaks with Washington State University researcher Dr. Giuliana Noratto about why an apple a day just might keep obesity away.