This study aimed to evaluate the effects of quercetin supplementation on the lipid profile, liver enzymes, inflammatory markers and body composition in non alcoholic fatty liver diease. Inclusion criteria included: Failure to alcohol abuse; Body mass index equal to or greater than 25-40 Kg / m2; Lack of other acute and chronic liver diseases and disorders; No history of biliary tract disease in the past; Lack of acute heart disease,inherited disorders affecting liver condition and Exclusion criteria: Not wanting to continue working, diseases that require special treatment,Reduction of more than 10% of baseline body weight during the intervention period, not consumption of more than 10% of the supplements in any follow-up period and in general, any inconsistent with the inclusion criteria. This study will be conducted on On 110 men and women with with nonalcoholic fatty liver disease, In two supplement and placebo groups confirmed by ultrasound. Intervention patients, receive 500mg capsule supplement daily, morning and evening on an empty stomach, while the placebo group received placebo twice daily500mg capsule that looks like the original supplements. anthropometric Data collection (weight, height, body mass index, etc.) and body composition analysis using the bioelectrical impedence analysis will be measured four times during the study. 10 ml of venous blood will be taken of people at the beginning and end of the study in fasting,.Measuring lipid profile variables and liver enzymes by enzymatic methods and inflammatory markers such as: tumor necrosis factor alpha and c-reacrive protein also will be measured using ELISA method.