Andreas Moritz
The digestive process is mostly controlled by the liver. The bile secreted by the liver is responsible for maintaining proper bowel health. Without sufficient bile, foods are not digested well and are subject to fermentation or putrefaction. Hence stools are not formed well and are sticky. Elimination is never complete, and something is always left behind. The normalize bile secretion, the bile ducts must be opened up and all stones be removed. This is done through liver flushing (see The Amazing Liver Cleanse, 1stbooks.com) for complete directions).
In addition, there are times of the day when foods are digested better than others. Sleep times exert the biggest influence on digestive functions. There are other reasons. To find out which ones apply to you and your bodytype, I suggest you read through The Key to Health and Rejuvenation, 1stbooks.com).
Best wishes,
Andreas