Portaline aminotransferase is found in the heart muscle cells and liver cells, and is less abundant in the blood. There are several reasons for low levels of portal aminotransferase: the first may be related to prolonged late nights, fatigue, and heavy alcohol consumption resulting in impaired liver function and decline. The second may be suffering from hepatitis, it is recommended to do a hepatitis virus marker test. The third reason is that some people have symptoms of malnutrition themselves, when there is a weakening of liver metabolism and a change in the value of the portal amino acid aminotransferase. Normal values for menthylate aminotransferase range from 0 to 40, but there are some individual differences. In order to prevent low portal amino acid aminotransferase, you must pay attention to your diet in general, not over dieting and avoid malnutrition. People with irregular work and rest schedules should also adjust and not stay up late drinking alcohol for a long time.