LDL cholesterol is <3.4 mmol/L in normal individuals, and excessive levels of LDL cholesterol 3.7 mmol/L exist. LDL cholesterol is the major lipoprotein in fasting plasma and consists of proteins, phospholipids, and triglycerides, which are the main carriers of cholesterol to extrahepatic tissues. Normal adult LDL cholesterol is <3.4 mmol/L. This physiologic indicator is useful in assessing liver function, hepatitis, hypertension, atherosclerosis, and other diseases. LDL cholesterol of 3.7 mmol/L is borderline elevated and can be caused by overweight and obesity, bad habits such as smoking and drinking, liver disease, etc. Sometimes too much exercise can also be the cause. Sometimes too much exercise may also cause this value to be high. If you have high LDL cholesterol, you can go to the hospital for examination and consultation with your doctor, and under the doctor's guidance, you can make adjustments or treatments. You should also eat more fresh vegetables and fruits and less high-fat food to avoid further elevation of LDL cholesterol, which may cause harm to the human body.