There can be surprising insights yielded from such an exercise. For example, if I think about what separates breads from cakes and muffins, I am forced to deal with the way that a typical "banana bread" (baked with lots of sugar and without yeast) is really a bread-shaped muffin more than a banana-flavored bread. This might seem overly semantic, but it does reflect differences in how it is baked and what it means nutritionally.