Apples aren’t the only food that keeps the doctor away. On top of their energy-revving carb, health-promoting antioxidant, and immunity-fostering vitamin C content, the magic of apples also comes from a different source: their fiber. What’s so special about this macronutrient? Besides helping us to stay “regular,” dietary fiber is also a powerful hunger zapper. By filling you up, slowing the rate at which you digest the rest of your food, and keeping your blood sugar levels stable—which maintains more consistent energy levels—fiber-filled fare keeps your hunger pangs from creeping up as often, which can significantly aid weight loss efforts.