LDL cholesterol is <3.4 mmol/L in normal people, and if the physiologic index is 3.47 mmol/L, then the LDL cholesterol is slightly above the normal level. LDL cholesterol is the major lipoprotein in fasting plasma and consists of proteins, phospholipids and triglycerides. Its main role is to act as a carrier of cholesterol in the body to transport cholesterol to the peripheral tissues for utilization by the peripheral tissues. Normal adult LDL cholesterol is <3.4 mmol/L. An LDL cholesterol of 3.47 mmol/L is considered high LDL cholesterol, i.e. hyperlipidemia. Excess lipids tend to be deposited on the walls of blood vessels, eventually leading to atherosclerosis. The causes of hyperlipidemia may be overweight and obesity, daily smoking and drinking, or suffering from liver disease. If hyperlipidemia exists, it is recommended to go to the hospital to improve the relevant examination, and under the guidance of the doctor to regulate or treat, control the blood lipid level in time to avoid the occurrence of atherosclerosis. You should eat more fresh vegetables and fruits, less high-fat food, pay attention to daily routine, and quit smoking and drinking if you have the habit of smoking and drinking.