The main ingredient in enriched bread is refined, white flour. To produce white flour, manufacturers remove the outer coating -- also known as the bran -- and the germ of the kernel. The endosperm or inside of the kernel is then ground into a fine flour. Bread manufacturers replace many of the nutrients lost during milling when preparing the dough for enriched bread so that it contains the same nutrients as those in whole-wheat bread, but they do not replace the fiber lost during milling.