OBJECTIVE - To determine the association between nonalcoholic fatty liver disease and the risk for development of diabetes. RESEARCH DESIGN AND METHODS- We conducted an observational cohort study in male workers >= 40 years old in a Japanese company from 1997 to 2005. We excluded workers with alcohol intake >= 20 g/day and those with impaired glucose tolerance by a 75-g oral glucose tolerance test. The remaining 3,189 workers were classified into fatty liver (FL) and non-FL group based on the findings of abdominal ultrasonography. Both groups were followed for the development of diabetes. Hazard ratio (HR) was determined in Cox proportional hazard analysis. A nested case-control study was conducted to determine the odds ratio (OR). RESULTS - The average age of participants was 48.0 years at the entry, and the average follow-up period was 4.0 years. The incidence of diabetes in the FL group was 2,011 per 101,1101 person-years (65 cases), whereas 452 per 100,000 person-years (44 cases) in the non-FL group. The age- and BMI-adjusted HR of diabetes associated with FL was 5.5 (95% Cl 3.6-8.5, P < 0.001). In the nested case-control analysis, the OR adjusted for age and BMI was 4.6 (3.0-6.9, P < 0.001). CONCLUSIONS - Nonalcoholic fatty liver disease significantly increases the risk of diabetes in middle-aged Japanese men.
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