Mild to moderate fatty liver is a condition in which the fat content in the liver cells is between 5% and 25%, when the function of the liver cells is at the level of unimpaired or slightly impaired. Fatty liver is caused by a variety of reasons, the accumulation of excessive fat in the liver cells, resulting in an imbalance in the breakdown and synthesis of fat in the liver. As a result, symptoms such as nausea, vomiting, loss of appetite and other discomforts occur. Clinically, fatty liver is categorized into three grades according to the fat content in liver cells, i.e. mild fatty liver, moderate fatty liver and severe fatty liver. A fat content of 5% to 10% in liver cells is considered mild, 10% to 25% is considered moderate, and more than 25% is considered severe. Common causes of fatty liver include alcoholism, obesity, and endocrine metabolic abnormalities. Patients with mild to moderate fatty liver should seek timely medical treatment under the guidance of professional doctors. In addition to this, they should also develop good living habits, such as not drinking alcohol and exercising regularly.