The exclusion criteria are: i) Any lifetime DSM-IV diagnoses of intravenous drug use or alcohol dependence, or if criteria for alcohol abuse were ever met, subject must have not met criteria for abuse within the last 12 months; ii) any history of hepatitis; iii) medications that can cause significant changes in hepatic function, glucose, or lipid metabolism, as determined by the investigator; iv) lipid lowering or glucose lowering medications; v) involuntary legal status (as per Missouri law); vi) pregnancy.