Gut microbiota as an efficacy marker of surgical treatment of obesity.

Objective: Aim: To study the impact of bariatric interventions on changes in the parameters of the intestinal microbiome.

Patients and methods: Materials and Methods: The research method is a prospective observational cohort monocentric study. 112 patients were included in the study. All patients had indications for surgical obesity treatment due to IFSO criteria. All patients were offered surgical treatment. 53 patients who consented to the operation formed the study group. 59 patients who refused surgical treatment formed the control group. The result of the study was evaluated one year after the start of treatment. The studied group of patients underwent bariatric interventions. The control group consisted of 59 obese patients who were treated conservatively.

Results: Results: evaluating criteria was: %EWL (percentage of excess weight loss), comorbidity regression, life quality improvement. Overwhelming majority of surgically treated patients with gut microbiome composition improvement reached %EWL≥50. Patients who didn't have improvements in gut microbiota composition had insufficient efficacy of surgical treatment.

Conclusion: Conclusions: 1) Surgical treatment of obesity leads to the positive changes in the gut microbiota. 2) Operated patients, who had positive dynamics in changes of gut microbiota demonstrated sufficient efficacy of surgical treatment due to %EWL. 3) Firmicutes/Bacteriodetes ratio and Bacterioidetes/Faecalibacterium ratio can be one of the criteria of the efficacy of surgical treatment of obesity. 4) Patients of the control group, had positive dynamics of changes in gut microbiota much rarely than operated patients and the effectiveness of obesity treatment was insufficient.