Remember that old phrase, “An apple a day keeps the doctor away?” It turns out there might be something to it. According to a new study, a compound found in apple peels can help stave off obesity in mice. The substance—ursolic acid—apparently ups muscle and brown fat, which can help burn calories.

Of course, there’s more research to be done (you know, with humans). But incorporating some crunchy apples into your diet couldn’t hurt. At best, you’ll be less prone to obesity and the host of diseases that come with it.