I've always loved eating apples, especially Granny Smith apples because they're sweet and a little tart. And according to research they're helping me build muscle and reducing fat--BONUS!

It's possible, as new research suggests that ursolic acid, which is found in abundance in an apple's peal, builds muscles while reducing fat.

In fact, in tests performed on lab mice, ursolic acid increased muscle tone by up to 15 percent, and reduced body fat by half.

Ursolic acid also appears to reduce blood sugar levels and cholesterol.

The next step for the University of Iowa scientists who made this discovery is to test ursolic acid's effects on humans.

If you like looking your best, you might as well get a head start and add more apples to your diet now - it can't hurt. (At the very least, now you know what to do if you want to own a really buff pet mouse.)

As I mentioned up top I'm a Granny Smith fan. What's your favorite kind of apple? Comment and let me know.