 Specific Aim 1: Measure IR and insulin clearance using intravenous glucose tolerance testing and Bergmans Minimal Modeling in patients with NAFLD as compared to matched controls healthy and those with non-steatotic hepatitis. This aim tests the postulate that IR is necessary for the development of hepatic steatosis as compared to healthy non-steatotic livers. It will also test the postulate that IR is not present as a confounding factor impaired hepatic clearance in NAFLD as compared to those with non-steatotic forms of hepatitis. 