There are many reasons for high urea nitrogen: first, eating too much protein; second, renal insufficiency can cause high urea nitrogen; third, common in infections, hyperthyroidism and other diseases of the gastrointestinal tract bleeding caused by increased protein decomposition, all will appear high urea nitrogen. 1, if the urea nitrogen is high simply because of eating too much protein, to reduce the intake of protein, eat more fresh vegetables or grains. 2. If the urea nitrogen is high due to renal insufficiency, it is recommended that the patient eat a high quality, low protein diet, which often refers to eggs, fish, lean meat, shrimp, milk, etc. 3. If the urea nitrogen is high due to gastrointestinal bleeding, it is recommended that the diet be banned during the acute phase of bleeding, and after the bleeding improves, you can eat liquid and light food, such as thin rice, noodles, etc. etc.