Fatty liver has many causes, the most common being obesity, as well as alcohol; long-term excessive drinking can cause alcoholic fatty liver. Other causes include malnutrition or long-term excessive use of certain medications, including anti-inflammatory drugs and corticosteroids, which can significantly damage the liver. Drugs used to lower blood lipids can also lead to fatty liver. Fatty liver is caused by these factors, not by an infection from a particular bacterium or virus, so it is not contagious. If you have fatty liver, it is recommended to exercise regularly under the guidance of a doctor. There are no shortcuts; only exercise can eliminate fatty liver.