The colon is a natural breeding ground for bacteria. The purpose and function of this bacteria is to neutralize and prevent a toxic condition from developing in the colon. There are two types of bacteria, the healthy, scavenging type known as bacilli coli and the pathogenic kind that causes disease. In a healthy environment, the good scavenging bacteria will control the pathogenic kind. When too much fermentation and putrefaction is generated in the colon as a result of neglecting to keep it as free from feces and waste as possible, the pathogenic bacteria grow and sickness can develop.
Waste must be expelled from the body and your colon is equipped with a very efficient system of elimination, as long as it is kept in good working order. The best diet in the world can be no better than the worst when the system of the colon is clogged with waste.
Unless we stop eating, it's impossible not to accumulate waste in the colon from the food we digest but in addition, millions of cells and tissues which after serving their purpose have been replaced by the body also end up in the colon as waste. These cells and tissues are dead proteins and can be highly toxic when allowed to ferment and putrefy. Cells and tissues in the anatomy decompose in our bodies when they are allowed to remain in the colon longer than necessary.
In simple words, the colon is your body's waste elimination system, it requires regular maintenance and cleansing.