Non-alcoholic fatty liver disease (NAFLD) occurs when excess fat builds up in the liver cells (from causes other than excessive alcohol consumption). The condition tends to occur more often in individuals who are overweight or obese or have diabetes, high cholesterol, or high triglycerides. A new study has found that a brisk walk is just as good as a jog when it comes to reducing the levels of fat in the liver cells of patients with NAFLD, which suggests those who have difficulty with vigorous exercise can still prevent and treat NAFLD with moderate activity. JAMA Internal Medicine, July 2016