Iron is an critical mineral in our meal plans. Our bodies use it to create red blood cells. It is actually in green leafy vegetables. But many of us do not get ample of it in our meals. When using a cast iron skillet, that you are cooking a number of that iron in to the foods. It is not to say you shouldn't also supplement your iron needs in other ways, but to say that cooking that has a cast iron skillet may have some passive nutritional benefits.