Fatty liver disease is an umbrella term for a range of liver conditions affecting people who drink alcohol or even those who do not take it. As the name implies, the main characteristic of fatty liver disease is too much fat stored in liver cells. This kind of fatty liver disease can progress to cirrhosis and liver failure. Nonalcoholic fatty liver disease is increasingly common around the world. It can occur in every age group but especially in people in their 40s and 50s who are at high risk of heart disease because of such risk factors as obesity and type 2 diabetes. The condition is also closely linked to metabolic syndrome, which is a cluster of abnormalities including increased abdominal fat, poor ability to use the hormone insulin, high blood pressure and high blood levels of triglycerides, a type of fat. Symptoms Include enlarged liver, tiredness and pain in the upper right abdomen.