Amino acid nitrogen may have some harmful effects on human body during its metabolism. Excessive amino acid nitrogen will be decomposed into ammonia, which will increase the burden on the kidney and may lead to renal function damage. In addition, ammonia is converted into urea in the liver and then excreted through the kidney, which will also cause certain burden and damage to liver and kidney function. Therefore, excessive intake of amino acid nitrogen may have adverse effects on human health. In order to keep healthy, it is suggested to control the intake of amino acids reasonably and avoid excessive intake.