What commonly causes fatty liver disease?

Fatty liver disease, particularly alcoholic liver disease, is primarily caused by excessive alcohol consumption. Alcohol metabolism produces harmful byproducts that can lead to fat accumulation in the liver, resulting in inflammation and liver damage over time. This condition is characterized by the presence of excess fat in liver cells, which can progress to more severe liver issues such as alcoholic hepatitis or cirrhosis if not managed properly.

In contrast, excessive exercise does not lead to fatty liver disease; rather, it typically promotes overall health and can help prevent various forms of liver disease. High fiber intake is beneficial and generally protective against liver diseases by improving metabolic health and aiding in weight management. A low protein diet, while it may lead to various nutritional deficiencies and health issues, is not a common cause of fatty liver disease like alcoholic liver disease is. The key factor with alcoholic liver disease is the direct impact of alcohol on liver function and fat metabolism.