Homocysteine is an amino acid used in protein metabolism, so homocysteine values are used as an indicator of whether protein is completely metabolized in the body. An increase in homocysteine can be caused by consuming too much meat, milk, eggs and other high protein foods, as well as by a lack of vitamin B12 or folic acid in the body. It can cause cardiovascular and cerebrovascular hazards, such as hypertension, atherosclerosis, etc. It should be prevented on weekdays: First, we should supplement vitamin B12 and folic acid, and we should eat less or moderate amount of meat, milk and other high-protein foods. Second, we should eat more fresh vegetables and fruits. Third, we should pay attention to monitoring blood pressure and blood lipids, and give symptomatic treatment with antihypertensive and lipid-lowering drugs if necessary.