2. Although protein is very beneficial to human body, excessive intake of protein will lead to excessive secretion of ammonia, ketoacid and urea, which will also bring side effects to the previous human body. protein will also lead to the burden on the liver and indigestion, which will lead to liver and kidney dysfunction in the long run. Excessive use of protein will also increase the risk of cancer, such as breast cancer, pancreatic cancer and kidney cancer. To judge the performance of protein's excessive intake.