The Atherosclerosis Index is an accurate indicator of atherosclerosis and should be less than 4. The Atherosclerosis Index is calculated by subtracting HDL from total serum cholesterol and dividing by HDL. If the value is less than 4, it means that the degree of atherosclerosis is not serious or the degree of atherosclerosis is decreasing, and the smaller the value, the lower the risk of atherosclerosis. If the value is greater than or equal to 4, it means that atherosclerosis has occurred, and the larger the value, the higher the degree of atherosclerosis or the incidence of cardiovascular disease. The main way to reduce the atherosclerosis index is to lower total serum cholesterol or raise HDL to reduce the total cholesterol content, and you should consume less egg yolk or animal viscera. HDL is a good lipid because it stabilizes atherosclerotic plaques, and the higher it is, the better.