Fatty liver is a condition that does not cause pain and has nonspecific symptoms like fatiuge, sometimes pain below right rib and rarely nausea and votmiting. Possible symptoms that could also be noticed are abdominal swelling, icterus, incrased body temperature, concentration and appetite loss. Complications are possible if not treated. The most important part od the treatment is nutrition. It is recommended to avoid fat, salty and fried food, increase fruit and vegetable intake and increase physical activitiy. Disease prognosis is good and satisfactory if the patient adheres to the instructions given by the nurse in the form of eduaction. This study aimed to explain and define the fatty liver disease. Liver anatomy and phsiology, pathology and pathophysiology of fatty liver are described and risk factors are determined in this study. Clinical presentation, diagnosis and treatment of the disease are stated. The most important part of this study involves a diet of the patient with a fatty liver disease, nurse's diagnosis and intervention and education of the nurse. Education of the nurse is an extremely important part od the patient's treatment because the nurse is the pearson from whom patient will seek co-operation and advice after diagnosing the disease. In patients with an acoholic fatty liver disease, the most common cause of the disease is alcohol consumption, but it colud also be a consequence of obesity, diabetes or drug overdose. The cause of a non-alcoholic fatty liver disease is a set of metabolic disorders- obesity, diabetes, hypertriglyceridemia and hypertension with insulin resistance in the background. A healthy lifestyle is important for people with a fatty liver disease. Moderate physical activity is recommended in consulation with the physician. Complication may occur if the patient does nost adhere to the instructions.