This study as a double-blind randomised controlled trial will be conducted in 84 overweight or obese patients with non-alcoholic fatty liver. Disease is diagnosed using ultrasonography by a radiologists. Patients are divided into nanocurcumin and placebo supplementation equal groups (ratio 1:1). The period of study is considered three months. Two 40mg capsules (nanocurcumin or placebo) will be included daily with breakfast and dinner meals. Advises of lifestyle changes include low-calorie diet and increasing physical activity. Food intakes, physical activity, weight, height, blood pressure and body composition of patients are measured at different visits. At the beginning and end of the study 10 ml blood from the brachial vein of patients will be taken to measure serum levels of liver enzymes (Alanin transaminase (ALT), Aspartate transaminase (AST)), fasting glucose (FBS) and insulin (FBI)), Hemoglobin A1C (HbA1C), lipid profile (Low Density Lipoprotein-Cholestrol (LDL) , High Density Lipoprotein-Cholestrol (HDL), Triglyceride (TG), Total Cholestrol (TC)), Interleukin-6 (IL-6), Tumor Necrosis Factor-alpha (TNF-α), high sensitive-C-Reactive Protein (hs-CRP) and nesfatin. Also, insulin indexes (Homeostatic model assessment-insulin resistance (HOMA-IR), Quantitative insulin sensitivity check index (QUICKI)) are calculated by the following formula:
QUICKI = 1 / (log (fasting insulin μU / mL) + log (fasting glucose mg / dL))
HOMA-IR = (FPI (mU / l) x FPG (mmol / l)) / 22.5