The gastrointestinal tract is a system consisting of the stomach and intestines, which implements the promotion and absorption into the blood and lymph of those nutrients that the system of digestion and assimilation of food has prepared for the body. The gastrointestinal tract has a special anatomical structure for the implementation of this function (muscle fiber for peristalsis, villi to increase the absorption surface, glands, etc.).

This system is in close connection with the system of digestion and assimilation of food and with the cardiovascular system. If the food in the process of digestion is not sufficiently processed by enzymes, bile or juices, then it sticks and rots on the intestinal walls and, ultimately, self-poisoning with toxins. Subsequently, tumors, polyps, cysts, neoplasms appear.

The work of the gastrointestinal tract is also affected by the presence of parasitic invasions - viruses, fungi, yeast, bacteria, worms in the intestines. It is very important to pay attention to updating the gene pool of beneficial microflora in the gastrointestinal tract, maintaining peristalsis, and removing feces from the body.