In this first pilot study, we will examine the effects of acetaminophen dosing in adult patients with NAFLD in comparison to the effects in a healthy control group. Both groups will receive 3 grams (g) of acetaminophen, the maximum recommended daily dose, daily for 14 days. We hypothesize that NAFLD patients are more prone to APAP toxicity than normal controls.Treatment will be stopped after two weeks or in the following conditions: