Daily intake foods also contain substances that are not digested in the gastrointestinal tract, do not undergo chemical breakdown and therefore they are not absorbed into the blood and lymph. Such non-nutrients include primarily plant fibers or dietary fiber. Digestive enzymes do not affect the noted high molecular weight organic matter. Therefore, they are often excreted from the body. Satiety effects of dietary fibers are also beneficial for health. It is an important concept in calorie restriction that is crucial in protection some degenerative diseases