Well, the ingredients include an entire apple, a few carrots, and oats. These items alone are a great base for any healthy muffin. Apples paired with the oatmeal provide a significant amount of fiber to this muffin.  Foods high in fiber also help you feel full longer, which is just another reason these make such a good breakfast or snack.   Both the carrots and the apples add a natural sweetness to the recipe, so I've cut back on the amount sugar compared to other recipes. And they still taste great!