What is the rate of incidence for non-alcoholic fatty liver disease?

Nonalcoholic fatty liver disease (NAFLD) is present in 10 to 20 percent of people in the United States. This condition on its own is not dangerous, and it reverses itself in many people with NAFLD. It is possible that the number of people with NAFLD is higher than research indicates, because on its own the condition causes no symptoms and often no ill effects until it has progressed beyond simple NAFLD into the more severe forms of the condition. Instances of NAFLD have become markedly more common recently, alongside large growths in the incidence of obesity, diabetes, and high cholesterol in people in the United States.