June 7, 2011
Image: Mice fed ursolic acid -- a waxy substance found in apple peel -- had smaller fat cells (image on right) than mice that did not get ursolic acid (image on left). In addition to reducing fat mass in mice, ursolic acid also increased muscle mass and strength.
Apple peel makes mice mighty
For Popeye, spinach was the key to extra muscle. For the mice in a new University of Iowa study, it was apples, or more precisely a waxy substance called ursolic acid that's found in apple peel.