If a food package boasts “Whole Grain” on the front, look at the list of ingredients on the back to make sure the first ingredient really is Whole, not just wheat or enriched. Natural fiber is derived only from fruits and vegetables along with the whole intact of grains, which includes the outside bran, the inside endosperm and germ. Fiber is then classified as Soluble or Insoluble which merely refers to its ability to dissolve in water.