A high HDL level of 2.05mmol/L is beneficial to the human body and can slow down the progression of atherosclerosis. The normal value of HDL is 1.04-1.55mmol/L, and 2.05mmol/L is on the high side. HDL cholesterol is one of the plasma proteins, and is a transport protein that transports cholesterol from the blood to the liver for storage, and reduces the level of cholesterol in the blood plasma. Elevated cholesterol levels promote the development of atherosclerosis. Elevated HDL lowers the level of plasma proteins that inhibit and slow the progression of atherosclerosis, and it is a beneficial protein for the human body. Patients with elevated HDL levels should be careful to maintain their current dietary habits and take care to monitor their HDL levels intensively.