Abstarct: Nonalcoholic fatty liver disease is a clinical condition that is characterized by the deposition of fat in liver cells, and its prevalence due to the development of technology, machine life, city-oriented, idlers, prosperity, the irregular use of the food and ultimately obesity is increasing is increasing day by day. The aim of this study was to investigate the prevalence of nonalcoholic fatty liver and its correlation with indices of body composition in men aged 45 to 80 years participating in the morning exercising in the Shahrood city. Subjects were selected by accessible sampling method and purposeful. A total of 80 men were volunteered to participate in the study. People who participated in morning excersing at least 3 days a week in the past 3 years, and that were lack any of the causes of non-alcoholic fatty liver disease were selected for the study. The people whose data on physical activity, body measurements and biochemical were not registered were excluded. Eventually, 49 men with a mean age (24/8 ± 75/61) were selected for study. Personal information (including age, sex, marital status, educational level, history of non-communicable diseases, surgical history, Medication name, addiction status, disability status, occupational activity, amount and type of physical activity) were obtained by demographic questionnaire and and dietary by Food frequency FFQ questionnaires. After measurement of liver enzymes and ultrasound of liver, anthropometric parameters (body weight, waist-to-hip ratio (WHR), body mass index (BMI), lean body mass (LMB), fat mass and percentage of body fat and basal mextabolic rate (BMR) were measured using BODY COMPOSITION device. Data analyzed using SPSS 21 software, Kolmogorov-Smirnov test was used for data normality and the of Pearson's correlation coefficient method was used to calculate the correlation between anthropometric indices and non-alcoholic fatty liver. The results show that the prevalence of nonalcoholic fatty liver in men participating in the morning workout and healthy subjects were 83/7% and 16/3% respectively and the severity of the disease in people were not the same, 63/41% of patients with fatty liver grade 1 and 36/59% of patients had fatty liver with grade 2 and their liver enzyme levels were within normal range for all these people. Given that subjects had a high-calorie eating plan, as well as 16/3% of patients had normal liver and all diseased people were in early-stage of disease and their liver enzymes were in normal range, these reflect the positive impact of a regular morning exercise to prevent the development and progression of the disease among the people participating in the morning workout. In this study, non-alcoholic fatty liver disease had a significant positive relationship with WHR, BMI, body weight, fat mass and percentage of body fat, so these parameters are presented as independent prognostic factors for nonalcoholic fatty liver disease in this study. At clinical routine work with knowledge of these indexes can predict the development of steatosis and these variables likely can represent the role of other mextabolic factors.