Our gut is not only an organ of digestion but is also our biggest defense system. With a surface of about 200 to 300 m ², it is the far more powerful organ of our body. Lives and eating habits but often very straining the intestines. The result is a disturbance of the functioning of and a failed settlement of bacteria and germs. A failed colonisation of the intestine bowel function is disturbed and bowel rests remain. Gases (flatulence) and toxins, which cause the autointoxication (to self poisoning from the colon) are formed. "Death sits in the gut" (by Metschnikoff) or the testimony of Victor Hugo's "The gut is the King of diseases" has been winged word are affiliated, a healthy colon for our health plays important role. Even Hippocrates has already 400 BC it pointed out that "a poor digestion is the root of all evil". Usually about 10 high 14 germs, where there are about 500 different species and strains live in the intestine. This as it were "good" intestinal bacteria make for a good functioning of the intestines, affect metabolism and repel harmful micro-organisms. They play a role in the supply of the vitamins by building various vitamins such as biotin, vitamin B12, and vitamin K. This good intestinal bacteria is replaced by an excess of pathogenic germs, then there apart from digestive disorders also weakening the defenses, because our gut is an important immune organ. Many mood disorders are due to an imbalance in the intestinal colonization, without having any particular disease can be diagnosed.