The oil used in daily life is mainly cooking oil. This type of oil is typically sold in bulk and is divided into two major categories: vegetable oil and animal oil. Among vegetable oils, olive oil has higher nutritional and health value. Scientific surveys have found that people in Mediterranean countries tend to live longer and have a lower incidence of cardiovascular diseases. Greeks consume 13 kilograms of olive oil per person annually, and have a lower incidence of heart disease. Olive oil is considered "the most suitable oil for human nutrition among all the oils discovered to date." There is not much olive oil available for sale domestically, but some studies suggest that rice bran oil, corn oil, wheat oil, a certain oil, sesame oil, peanut oil, soybean oil, etc., are also rich in unsaturated fatty acids and are good sources of fat supplementation.
Among animal oils, lard is the most easily accessible type for people in this country. Lard contains excessive saturated fat, but it also contains arachidonic acid, which can lower blood lipids and prevent cholesterol buildup—effects that vegetable oils cannot achieve. The docosapentaenoic acid in fatty meat is a long-chain unsaturated fatty acid, which is closely related to the growth and development of the human nervous system and brain tissue. It also contains a special lipoprotein that can extend lifespan and has the effect of preventing vascular diseases and hypertension. However, consuming fatty meat also means ingesting saturated fat. To overcome this drawback, the key lies in proper cooking methods. Properly cooked fatty meat is a longevity food. Experts have found through analysis that after boiling pork over low heat for 1-2 hours, its saturated fatty acid content decreases by 30%-50%, while the unsaturated fatty acid content doubles.