A large share in the uniqueness of the human sensibility to the world around, take the bacteria that live in ours bodies. Most of the bacterial cells (Microbiota) is located in the intestines. Intestinal microbiota (microorganisms) - community of different microbiota, makes the desired function of the body. Microorganisms exist in union with the body and the immune system. Weak microorganisms lead the immune system and the digestive system to the inadequate response to the environment, food (allergies, food intolerance) and the general disruption of the vital functions.

     Negatively affect the intestinal microflora: drugs, intervention (e.g. colon), food behavior, including some kinds of diets, the environment.
   - Ultra-processed foods with the addition of simple sugars easily absorbed by the body, without the aid of bacteria, in contradistinction to the fruits and vegetables that contain a large number of fibers.
   - Urban agglomeration of the world's population has been steadily increasing. It is generally accepted that the city is more sanitized than a village, what we found is not very good. But studies have found that the number of bacteria in urban environments and on farms is similar. The difference in bacterial diversity.

Used: sciencemag