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Background  Fatty liver disease (FLD) including non-alcoholic fatty liver disease (NAFLD), a rapidly emerging and widely recognized liver disease today, is regarded as a hepatic manifestation of metabolic syndrome.  Helicobacter pylori , one of the most common pathogens worldwide, has been reported to be associated with metabolic syndrome, but whether there is a direct association with FLD is as of yet unclear. The aim of this study was to clarify the association of FLD and NAFLD with causative background factors including  Helicobacter pylori  infection.    Methods  This was a cross-sectional study of Japanese adults who received medical checkups at a single medical center in 2010.Univariate and multivariate statistical analysis was performed to evaluate background factors for ultrasonography diagnosed FLD. Subjects free from alcohol influence were similarly analyzed for NAFLD.    Results  Of a total of 13,737 subjects, FLD was detected in 1,456 of 6,318 females (23.0 %) and 3,498 of 7,419 males (47.1%). Multivariable analyses revealed that body mass index (standardized coefficients of females and males (β-F/M) =143.5/102.5), serum ALT (β-F/M = 25.8/75.7), age (β-F/M = 34.3/17.2), and platelet count (β-F/M = 17.8/15.2) were positively associated with FLD in both genders. Of the 5,289 subjects free from alcohol influence, NAFLD was detected in 881 of 3,473 females (25.4%) and 921 of 1,816 males (50.7%). Body mass index (β-F/M = 113.3/55.3), serum ALT (β-F/M = 21.6/53.8), and platelet count (β-F/M = 13.8/11.8) were positively associated with NAFLD in both genders. Metabolic syndrome was positively associated with FLD and NAFLD only in males. In contrast,  Helicobacter pylori  infection status was neither associated with FLD nor NAFLD regardless of gender.    Conclusions  Body mass index, serum ALT and platelet count were significantly associated with FLD and NAFLD, whereas infection of  Helicobacter pylori  was not.    Electronic supplementary material  The online version of this article (doi:10.1186/s12876-015-0247-9) contains supplementary material, which is available to authorized users.

bmc gastroenterology

Helicobacter pylori infection is not associated with fatty liver disease including non-alcoholic fatty liver disease: a large-scale cross-sectional study in Japan