Fatty liver disease occurs when fat builds up in the liver. There are three main types: non-alcoholic fatty liver disease (NAFLD) which occurs without heavy drinking, alcoholic fatty liver disease (AFLD) caused by excess alcohol consumption, and acute fatty liver of pregnancy (AFLP) which affects mothers during the third trimester. Dietary and lifestyle changes can help manage fatty liver disease, including losing weight, reducing alcohol intake, following a low-calorie low-fat diet, and exercising regularly. Managing conditions like diabetes is also important for fatty liver patients.