What is known?
Over the last decade non-alcoholic fatty liver disease (NAFLD) has become the most common chronic liver disease in Western world. There are still no approved therapy for NAFLD treatment. Some authors have published data about beneficial effects of coffee consumption in diabetes mellitus, while some other reported its usefulness in the context of fibrosis, cirrhosis, and hepatocellular carcinoma in chronic hepatitis C infected patients. Some reports had shown that short sleep duration was associated with NAFLD prevalence, while some other studies reported that that long sleep duration related to incident NAFLD. Finally, smoking is an acknowledged risk factor for developing metabolic syndrome, which is risk factor for NAFLD development.