APPLE SKINS

 

Research posted a few years ago in the journal PLoS ONE found that the skins of apples contain ursolic acid.  Ursolic acid is believed to boost metabolism by increasing muscle mass and a type of body fat that helps to burn calories.  So when eating an apple, you might want to consider not peeling it.  This is a case where you might want to go organic so you can be sure your apples haven't been chemically sprayed.