The normal value of LDL cholesterol is less than 3.37 mmol/L. However, for patients with coronary heart disease and diabetes, the current recommended LDL cholesterol should be less than 1.80 mmol/L or even 1.40 mmol/L. Prevent the occurrence of coronary heart disease and other diseases. LDL cholesterol is often referred to as a relatively bad cholesterol, mainly because it can cause atherosclerosis, leading to the occurrence of coronary heart disease, cerebral infarction and other diseases. The main causes of elevated LDL cholesterol are unreasonable dietary structure, excessive intake of meat and fried foods as well as obesity and low exercise, which can cause the index to increase, as well as excessive mental stress, staying up late, smoking and drinking alcohol, which can also cause the index to increase.