There are many reasons for high urea nitrogen: first, eating too much protein; second, renal insufficiency can cause high urea nitrogen; third, commonly found in infections, hyperthyroidism and other gastrointestinal bleeding caused by increased protein decomposition of the disease, will appear high urea nitrogen. 1, if simply because of eating too much protein leads to high urea nitrogen, to reduce the intake of protein, and eat more fresh vegetables or grains, etc. 2, if it is caused by kidney insufficiency, this time we recommend that the patient quality low-protein diet. If the urea nitrogen is high due to renal insufficiency, it is recommended that the patient should have a high quality and low protein diet, the so-called high quality protein often refers to eggs, fish, lean meat, shrimp, milk, etc. If the urea nitrogen is high due to gastrointestinal bleeding, it is recommended to prohibit the diet in the acute stage of bleeding, and after the bleeding improves, you can eat fluids and light food, such as thin rice and noodles. After the bleeding has improved, you can eat fluids and light foods, such as thin rice, noodles, etc.