How long does it take for fatty liver to progress to cirrhosis? Fatty liver is generally divided into mild, moderate, and severe fatty liver. If it is mild or moderate fatty liver, it can be reversed through proper exercise and diet control, meaning it can be cured. However, once it progresses to severe fatty liver, it can easily develop into cirrhosis, but the specific time required is about five years. Therefore, once we have fatty liver, it must be taken very seriously. With the improvement of living standards, most people are obese, which means that fatty liver is mostly caused by obesity. In terms of treatment, the focus is mainly on the cause, which is obesity. Patients need to follow a reasonable diet and actively exercise to lose weight. If successful in losing weight, fatty liver can be reversed, and we do not have to worry about fatty liver developing into cirrhosis.