Heart failure (HF) is relatively common cardiovascular disease with high mortality and morbidity. Although it is associated with many cardiovascular risk factors, the association between nonalcoholic fatty liver disease (NAFLD), the most common chronic liver disease, and HF has not been evaluated in a large-scale cohort study. Thus, we evaluated the ability of the fatty liver Index (FLI), a surrogate marker of NAFLD, to predict the development of HF in healthy individuals. Methods We evaluated

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... 08,578 healthy persons without comorbidities who underwent the National Health check-ups in the republic of Korea from 2009 to 2014. The association between the FLI and HF was analyzed using multivariate Cox proportional-hazards models. Results During a median of 5.4 years' follow-up, 2,532 subjects (0.8%) were newly diagnosed with HF. Subjects were categorized into quartile groups according to FLI (Q1, 0-4.9; Q2, 5.0-12.5; Q3, 12.6-31.0; and Q4, >31.0). The cumulative incidence of HF was significantly higher in subjects with the highest FLI than in those with the lowest FLI (Q1, 307 0.4% and Q4, 890 1.2%; P<0.001). Adjusted hazard ratios (HRs) indicated that the highest FLI was independently associated with an increased risk for HF (HR between Q4 and Q1, 2.709; 95% confidence interval=2.380-3.085; P<0.001). FLI was significantly associated with increased risk of new-onset HF regardless of their baseline characteristics. Conclusions Higher FLI was independently associated with increased risk of HF in healthy Korean population. introduction Non-alcoholic fatty liver disease (NAFLD) is the most common form of chronic liver disease. Its estimated prevalence is about 15-30% in general population [1]. The prevalence of NAFLD has been increasing along with the increase of obesity, insulin resistance and non-insulin dependent diabetes mellitus, and metabolic syndrome [2]. * Cox proportional hazard models including age, and sex as covariates † Cox proportional hazard models including age, sex, and clinical characteristics, of which 23 association with new onset heart failure showed borderline statistical significance (P <