Fatty liver can be completely cured. Fatty liver is a benign and reversible disease that can be completely and totally cured and restored to a normal liver if the cause is removed, diet is controlled, and exercise is performed. Patients with fatty liver need to be treated even if they have no symptoms, not necessarily with liver-protective drugs, but mainly by removing the causes, exercise, and weight loss. Fatty liver is often combined with other systemic diseases, so treating fatty liver can prevent the aggravation of other systemic diseases. Prevention of fatty liver is better than treatment, and education and behavioral interventions must be enhanced in high-risk groups. If fatty liver is left untreated, it can gradually progress and the aggravation can lead to cirrhosis, which can also have various complications and eventually can malign into liver cancer. Moreover, fatty liver is a chronic disease, and relapse can occur after treatment.