Human gastrointestinal microbiota, also known as gut flora or gut microbiota, are the microorganisms (generally bacteria and archaea), that live in the human digestive tracts.
Our gut microbiota contains tens of trillions of microorganisms, including at least 1000 different species of known bacteria with more than 3 million genes (150 times more than human genes).
Microbiota can, in total, weigh up to 2 kg. One third of our gut microbiota is common to most people, while two thirds are specific to each one of us. In other words, the microbiota in our intestine has an individual identity.
As its name states, gut microbiota is harboured in the intestine, one of the main areas in our bodies that comes into contact with the external environment (other examples are the skin and the lungs).
The gut microbiota of each individual is unique. It contributes to how a person fights diseases, digests food, and processes psychological events and emotions.
The gut microbiota of each individual is unique. It contributes to how a person fights diseases, digests food, and processes psychological events and emotions.