That old adage of “an apple a day keeps the doctor away” isn’t a bad one to abide, but perhaps it should be changed to “an apple peel a day…” A new study says the peel is not only full of heart-healthy fiber; it also helps prevent muscle deterioration and keeps our waistlines in check. Apparently, they contain ursolic acid, which researchers have found keeps our blood sugar and cholesterol levels in check. No one sells apple peel chips yet, but the news will at least save us time the next time we bake an apple pie. And let’s not forget about all the other fruits and veg out there with delicious peels we far too often remove. Turns out the peel of most of our produce have illness-fighting properties and can boost our immune systems. Here’s some interesting facts of different peels and skins that you should be including in your diet. Never peel again!