Onion, also known as bulb onion, contains a volatile oil with diallyl disulfide compound. This compound can lower blood lipids, prevent arteriosclerosis and myocardial infarction, and reduce blood pressure. Generally, for patients with coronary heart disease and arteriosclerosis, consuming 50-75 grams of onion daily has a more ideal effect than taking lipid-lowering drugs. The exudate of onion contains a small amount of prostaglandin A, which can relax blood vessels, reduce blood viscosity, and increase coronary blood flow.