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Incidence of type 2 diabetes after bariatric surgery: population-based matched cohort study

Booth, Helen, Khan, Omar, Prevost, Toby, Reddy, Marcus, Dregan, Alex, Charlton, Judith, Ashworth, Mark, Rudisill, Caroline, Littlejohns, Peter and Gulliford, Martin C. (2014) Incidence of type 2 diabetes after bariatric surgery: population-based matched cohort study. The Lancet Diabetes and Endocrinology, 2 (12). pp. 963-968. ISSN 2213-8587

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Identification Number: 10.1016/S2213-8587(14)70214-1


Background:- The effect of currently used bariatric surgical procedures on the development of diabetes in obese people is not well defined. We aimed to assess the effect of bariatric surgery on development of type 2 diabetes in a large population of obese individuals. Methods:- We did a matched cohort study of adults (age 20–100 years) identified from a UK-wide database of family practices, who were obese (BMI ≥30 kg/m2) and did not have diabetes. We enrolled 2167 patients who had undergone bariatric surgery between Jan 1, 2002, and April 30, 2014, and matched them—according to BMI, age, sex, index year, and HbA1c—with 2167 controls who had not had surgery. Procedures included laparoscopic gastric banding (n=1053), gastric bypass (795), and sleeve gastrectomy (317), with two procedures undefined. The primary outcome was development of clinical diabetes, which we extracted from electronic health records. Analyses were adjusted for matching variables, comorbidity, cardiovascular risk factors, and use of antihypertensive and lipid-lowering drugs. Findings:- During a maximum of 7 years of follow-up (median 2·8 years [IQR 1·3–4·5]), 38 new diagnoses of diabetes were made in bariatric surgery patients and 177 were made in controls. By the end of 7 years of follow-up, 4·3% (95% CI 2·9–6·5) of bariatric surgery patients and 16·2% (13·3–19·6) of matched controls had developed diabetes. The incidence of diabetes diagnosis was 28·2 (95% CI 24·4–32·7) per 1000 person-years in controls and 5·7 (4·2–7·8) per 1000 person-years in bariatric surgery patients; the adjusted hazard ratio was 0·20 (95% CI 0·13–0·30, p<0·0001). This estimate was robust after varying the comparison group in sensitivity analyses, excluding gestational diabetes, or allowing for competing mortality risk. Interpretation:- Bariatric surgery is associated with reduced incidence of clinical diabetes in obese participants without diabetes at baseline for up to 7 years after the procedure.

Item Type: Article
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Additional Information: © 2014 The Author. Open Access article distributed under the terms of CC BY 3.0. Published by Elsevier Ltd.
Divisions: Social Policy
LSE Health
Subjects: H Social Sciences > HV Social pathology. Social and public welfare. Criminology
R Medicine > RA Public aspects of medicine > RA0421 Public health. Hygiene. Preventive Medicine
R Medicine > RC Internal medicine
Date Deposited: 11 Nov 2014 10:07
Last Modified: 20 Oct 2021 02:12
Funders: Open Access funded by Department of Health UK, NIHR Biomedical Research Centre at Guy's and St Thomas' NHS Foundation Trust and King's College London, UK National Institutes for Health Research (NIHR) Health Services and Delivery Research programme

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