the human gut microbiota - conceptual

039 axis bacteria barrier beneficial bowel chronic colitis colon colonization commensal constipation crohn digestive disease diseases enteric enterotype fecal feces fermentation fermenting fiber flora gastrointestinal gut gutbrain healthy human ibs idiopathic immune immunity inflammation inflammatory intestinal intestines irritable metabolism microbiome microbiota microorganisms mutualistic pathogens postbiotics prebiotics probiotics protection psychobiotics sibo symbiotic synbiotics syndrome system therapeutics tract transplant ulcerative