ABSTRACT
Gut microbiota is one of the complicated eco-systems in human body.A large amount of bacteria colonize in the healthy human intestine, which not only play a variety of biological functions, but also are associated with various diseases.By adding microecological agents (probiotics, prebiotics, and synbiotics), we are able to improve the gut microbiota structure and reduce the related carcinogenic metabolites, and also to improve the clinical manifestations of certain diseases.Therefore, it is meaningful to apply microecological agents (probiotics, prebiotics, and synbiotics) both in healthy population and patients.We reviewed the researches on microecological aspect of gut microbiota-related diseases, aiming to shed some light on fully understanding and popularizing of the application of microecological agents among different populations.