Study Procedures (Healthy and NAFLD/NASH Subjects) Screening (Week -2) Prior to initiation of the timeline, all potential study participants will be evaluated by a research nurse to obtain informed consent, a brief medical history, height, weight, body mass index, waist/hip circumference, vital signs, approximately 20mls. of blood for screening labs and urine for analysis. NAFLD/NASH subjects with no available liver serologies will have an additional 25 mls of blood drawn. This visit will take approximately 60 minutes and will include a screening questionnaire for family history of disease, activities of daily living (ADL), and alcohol consumption. Diabetic subjects will also withhold their oral diabetic agent prior to the fasting screening labwork.