Today, Americans eat around 16 billion quarts of popcorn every year making it the nation's favorite snack food by volume. Naturally rich in protein, vitamins, minerals and antioxidants, low calorie air-popped popcorn has more iron than eggs and more fiber than traditional salty snacks. In addition to being healthy, it's wallet-friendly. For about 25 cents, you can pop enough kernels to satisfy a family of four. If that's not enough to whet your appetite, what makes popcorn the greatest snack is its ability to adapt to consumers' ever-changing palettes.