There are two separate blood supplies in the body. The system blood supply that circulates in the muscles and brain etc and the portal blood supply which circulates blood from the intestines to the liver. The portal blood supply also has a branch that goes to the rectum. The blood supplies are separate because blood from the intestines contains the nutrients from the food we eat and also bacteria and toxins. The liver filters out the nutrients and separates the bacteria and toxins and transfers clean blood back to the system blood supply.
In summary, coffee is brewed, cooled and then introduced to the lower bowel via a one-quart enema. The fluid is retained for 15 minutes (or as long as possible). Caffeine, theophylline and theobromine, combine to stimulate the relaxation of smooth muscles causing dilatation of blood vessels and bile ducts. The effects of having a coffee enema are not the same as drinking coffee. The veins of the anus are very close to the surface of the tissue. The caffeine is therefore absorbed more quickly (and in higher concentration) than it is in when coffee is drunk. Additionally, coffee has a chemical makeup that is stimulative. The enzymes in coffee, known as palmitates, help the liver carry away the toxins in bile acid. The coffee is absorbed into the hemorrhoidal vein, then taken up to the liver by the portal vein. With the bile ducts dilated, bile carries toxins away to the gastro-intestinal tract. Simultaneously, peristaltic activity is encouraged because of the flooding of the lower colon. Thus, when the colon is evacuated, the toxins and bile are carried out of the body. For most people a coffee enema daily for ten days, followed by one per week for six weeks provides a good liver purge.