The purpose of this study is to investigate the effects of coffee main constituents (caffeine and chlorogenic acid) supplements on inflammatory, metabolic factors, hepatic steatosis and fibrosis in none- alcoholic fatty liver patients with type 2 diabetes. Two hundred patients with fatty liver and type 2 diabetes will be randomly assigned to one of four groups: group 1, caffeine (200 mg/d) plus chlorogenic acid (200 mg/d); group 2, caffeine (200 mg/d) plus placebo; group 3, chlorogenic acid (200 mg/d) plus placebo; group 4, placebo plus placebo. Supplementation will be daily and will supervise for 6 months.