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        Association between the Blautia/Bacteroides Ratio and Altered Body Mass Index after Bariatric Surgery

        김윤홍,손두헌,김부경,김기현,서경원,정경원,박선자,임상현,김재현 대한내분비학회 2022 Endocrinology and metabolism Vol.37 No.3

        Background: Current evidence support that the gut microbiota plays a potential role in obesity. Bariatric surgery can reduce excessweight and decrease the risk of life-threatening weight-related health problems and may also influence gut microbiota. In this study,we aimed to investigate the changes in gut microbiota before and after bariatric surgery and evaluate the association of the gut microbial shift and altered body mass index (BMI) after bariatric surgery. Methods: Between January 2019 and July 2020, stools from 58 patients scheduled for bariatric surgery were collected. Six monthsafter bariatric surgery, stools from 22 of these patients were re-collected, and the changes in gut microbiota before and after bariatricsurgery were evaluated. In addition, the differences in gut microbiota between patients with severe obesity (BMI >35 kg/m2, n=42)and healthy volunteers with normal BMI (18.8 to 22.8 kg/m2, n=41) were investigated. Results: The gut microbiota of patients who underwent bariatric surgery showed increased α-diversity and differed β-diversity compared with those before surgery. Interestingly, Blautia was decreased and Bacteriodes was increased at the genus level after bariatricsurgery. Further, the Blautia/Bacteroides ratio showed a positive correlation with BMI. To validate these results, we compared thegut microbiota from severely obese patients with high BMI with those from healthy volunteers and demonstrated that the Blautia/Bacteroides ratio correlated positively with BMI. Conclusion: In the gut microbial analysis of patients who underwent bariatric surgery, we presented that the Blautia/Bacteroides ratio had changed after bariatric surgery and showed a positive correlation with BMI.

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