Fecal Transplant & Microbiome
topic
Fecal microbiota transplantation (FMT) is the procedure of transferring processed stool from a healthy donor to a recipient's gut — delivering a diverse community of donor microorganisms to restore or diversify the recipient's disrupted microbiome. It is established as the most effective treatment for recurrent Clostridioides difficile infection (90%+ success rates) and is under active investigation for inflammatory bowel disease, obesity, metabolic syndrome, autism spectrum disorders, depression, and a range of conditions where microbiome dysbiosis is implicated.
Role
FMT represents the most dramatic demonstration of the microbiome's causal role in health — with mice receiving gut microbiota from obese human donors gaining weight and those receiving microbiota from lean donors remaining lean on identical diets, and with the successful treatment of C. difficile infections through microbiome restoration providing proof-of-concept that systemic health can be transformed by microbial community replacement. While FMT remains a specialized medical procedure, understanding it clarifies the mechanism through which diet, probiotics, and fermented foods exert their health effects — all are microbiome modification interventions operating on the same principle as FMT, just through slower and less dramatic means.