Now, however, when the intestinal contents reach the colon, it becomes desirable to remove most of the water prior to the process of defecation. The healthy colon will absorb only water from the mass. Contrary to popular opinion, faeces is not simply undigested food, such cellulose. That is only a par of the composition. Faeces is about 25 to 30 percent solids, the remainder is water.
Bacteria comprise about one third of the dry weight.
Only a small amount of actual food residue is present. Mucous and cells shed from the intestinal mucous are present. There is also bile, fat and unabsorbed intestinal secretions With this composition of faeces in mind, it is easy to understand why bowel movements continue, even during a fast. It is also important to note that the bowel movements are not nearly so related to food intake as many people believe. Many factors other than food intake are concerned.