Anyone who has not actually seen (and smelled) what comes out of an "average" apparently healthy person during colonics will really believe it could happen or can accurately imagine it. Often there are dark black lumpy strings, lumps, or gravel, evil smelling discs shaped like sculpted hemispheres similar to the pockets lining the wall of the colon itself. These discs are rock-hard and may come out looking like long black braids. There may also be long tangled strings of gray/brown mucous, sheets and flakes of mucous, and worse yet, an occasional worm (tape worm) or many smaller ones. Once confronted however, it is not hard to imagine how these fecal rocks and other obnoxious debris interfere with the proper function of the colon. They make the colon's wall rigid and interfere with peristalsis thus leading to further problems with constipation, and interfere with adsorption of nutrients. Our modern diet is by its "de-"nature, very constipating. In the trenches of the First World War, cheese was given the name 'chokem ass' because the soldiers eating this as a part of their daily ration developed severe constipation. Eaten by itself or with other whole foods, moderate amounts of cheese may not produce health problems in people who are capable of digesting dairy products. But cheese when combined with white flour becomes especially constipating. White bread or most white-flour crackers contain a lot of gluten, a very sticky wheat protein that makes the bread bind together and raise well. But white flour is lacking the bran, where most of the fiber is located. And many other processed foods are missing their fiber. In an earlier chapter I briefly showed how digestion works by following food from the mouth to the large intestine. To fully grasp why becoming constipated is almost a certainty in our civilization a few more details are required. Food leaving the small intestine is called chyme, a semi-liquid mixture of fiber, undigested bits, indigestible bits, and the remains of digestive enzymes. Chyme is propelled through the large intestine by muscular contractions. The large intestine operates on what I dub the "chew chew train" principle, where the most recent meal you ate enters the large intestine as the caboose (the last car of a train) and helps to push out the train engine (the car at the front that toots), which in a healthy colon should represent the meal eaten perhaps twelve hours earlier. The muscles in the colon only contract when they are stretched, so it is the volume of the fecal matter stretching the large intestine that triggers the muscles to push the waste material along toward the rectum and anus.