Relevance of gutmicrobiota in cognition, behaviour and Alzheimer's disease.

Approximately 95% of the symbiotic microbes in human body are located in the gut. This microbioma is involved in important homeostatic processes, not only related to gastrointestinal function but also to several complex modulatory processes, such as glucose and bone metabolism, inflammation and immune response, peripheral (enteric) and central neurotransmission. For that reason, recent studies proposed that abnormalities in gut microbiota may play a role in systemic and central nervous system (CNS) conditions.