Overweight/obesity and gastrointestinal disease incidence in Denmark-a cohort study.
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OBJECTIVE: Obesity is associated with various gastrointestinal (GI) conditions. Because of the epidemic rise of obesity, we examined associations between overweight/obesity and incidence of individual GI diseases. DESIGN: Cohort study. SETTING: Denmark, 1997-2018. PARTICIPANTS: Using nationwide healthcare registries, we identified All Danes ≥18 years with a hospital diagnosis of overweight/obesity. We created an age- and sex-matched general population comparison cohort. EXPOSURE: A diagnosis code of overweight/obesity. MAIN OUTCOMES AND MEASURES: We compared the incidence of hospital-diagnosed GI diseases from 1 year after overweight/obesity diagnosis. RESULTS: We included 129 466 patients with overweight/obesity (70.9% female, median age 49.3 years). Their incidence rate of GI disease was 30.1 per 1000 person years (95% CI: 29.8-30.5) vs 16.7 (95% CI: 16.5-16.8) for comparators, yielding an adjusted hazard ratio (aHR) of 1.7 (95% CI: 1.7-1.7). The aHRs indicated elevated risk of all GI disease sub-types in the overweight/obesity cohort, including cholelithiasis: 2.8 (95% CI: 2.7-2.9), cholecystitis: 2.6 (95% CI: 2.4-2.8), acute pancreatitis: 2.2 (95% CI: 2.0-2.4), stomach ulcer: 2.0 (95% CI: 1.9-2.1), cirrhosis: 1.5 (95% CI: 1.3-1.7), and obesity-associated GI cancer: 1.2 (95% CI: 1.2-1.3). The aHR for any GI disease was 1.4 (95% CI: 1.4-1.5) in men and 1.9 (95% CI: 1.8-1.9) in women. Among patients 18 to <30 years, the aHR was 2.6 (95% CI: 2.5-2.7) vs 1.3 (95% CI: 1.3-1.4) among individuals ≥70 years. CONCLUSIONS AND RELEVANCE: Overweight/obesity is a risk factor for a wide range of GI diseases and is expected to become an even greater clinical challenge in the future.