Want to bulk up? Eat your apples.

Apple peels could be the next superfood — for everyone from astronauts to bodybuilders. A substance found in the peel of an apple not only prevents muscle wasting, but also helps muscles grow more. Ursolic acid is currently used in cosmetics and is rumored to be able to help with some types of cancer. This new research shows that it's good for more than that, and could be a lifesaver for anyone trying to help their muscles along.

In mice, the compound managed to significantly reduce muscle atrophy and boost muscle growth, while also reducing fat, blood sugar levels, cholesterol and triglycerides in the animals. The mice who ate the compound were protected from atrophy caused by both fasting and nerve damage; and the healthy animals saw an increase in muscle mass, but not overall weight, due to its fat-busting capabilities.

Ursolic acid is also found in basil, bilberries, cranberries, elder flower, peppermint, rosemary, lavender, oregano, thyme, hawthorn, and prunes — but it's the most concentrated in apple peels. The researchers are now hoping to move onto human trials. I'm just planning on eating lots of apple peels.