Guanidine, histamine and other organic toxins may be formed as a result of bacterial action. This may occur either locally or from the ingestion of rancid fats. The end product of rancidity is peroxides which are harsh irritants. Carbohydrates are primarily concerned. Nitrogen is the principal component of intestinal gas.
Nature is normally a good intestinal housekeeper.
Both bile and hydrochloric acid have antiseptic effects. Digestive enzymes assist by keeping down the presence of undigested foods. Many foods have a beneficial effect in maintaining the intestinal environment. Some foods are to be watched with a suspicious eye. Recently, a number of articles have appeared in medical journals reporting on malabsorption syndrome caused by the eating of a common food.