In China, there are two main production processes of edible oil: leaching and pressing. Among them, more than 80% edible oil production enterprises adopt leaching method, and less than 20% edible oil adopts squeezing process. Leached oil occupies the main share of China edible oil market with its advantages of high oil yield and low price. However, in recent years, pressed oil has vigorously entered the edible oil market under the banner of "health and safety" and won great recognition from most merchants and consumers for a time. It is understood that pressing method and leaching method are two different oil-making processes. The pressing method is a pure physical pressing process to make oil, which is made by selecting materials, baking, physical pressing and finally filtering natural plant fibers. The method does not involve adding chemical substances, retains rich nutrition in oil, has no chemical solvent pollution, and does not contain any chemical antiseptic antioxidants, thus ensuring the safety, purity, nutrition and deliciousness of the product, meeting the health needs of human beings and being suitable for long-term safe eating. But the disadvantage is that the oil yield is low. At present, "oil pressing technology" is basically used in high-grade oil products such as peanut oil, olive oil, nut oil and sesame oil in China. Leaching method is that the oil raw materials are fully soaked in solvent oil, then extracted at high temperature, and then treated by "six-removal" process (degreasing, degumming, dehydration, decoloration, deodorization and deacidification), which is characterized by high oil yield and low production cost. However, in the process of leaching, solvent residue in edible oil is inevitable. According to the national standard, even the qualified leached soybean oil is allowed to contain 10 mg of solvent residue per kilogram. To this end, the relevant person of China Vegetable Oil Industry Association believes that from the perspective of safety and environmental protection, the quality of pressed oil is relatively pure because it can maintain its original nutrition; But it is difficult to satisfy people's consumption psychology of pursuing natural environmental protection of food. At the same time, Professor Nong Shao Zhuang, director of the National Food and Nutrition Society and member of the National Food Quality and Safety Professional Teaching Steering Committee, said that the two oils have their own advantages and disadvantages. The quality of edible oil depends on whether the operation in the production process is standardized. As long as it meets the national standards, it can be safely eaten. Nutrition is preferred, and high-grade natural peanut oil is favored. Peanut is a traditional food that people in China like. Peanut was called "longevity fruit" by the ancients because of its medicinal value and health care function. Nutritive and healthy high-grade natural edible oil represented by peanut oil is being favored by more and more consumers. To this end, some experts believe that the edible oil market in China has begun to enter the era of nutrition priority. Nutritionists found β -sitosterol in peanuts and peanut products. This nutrient can not only prevent hypertension, hyperlipidemia and hyperglycemia, but also prevent heart disease. As a natural nutrient in plants, β -sitosterol can protect cardiovascular and cerebrovascular diseases by removing the residual substances in intestinal wall, activating cells and lowering cholesterol in blood. Professor Chris Eisenter, who studies the prevention of cardiovascular diseases at the University of Pennsylvania, found that eating olive oil, peanut oil and peanut products can reduce the risk of cardiovascular diseases by 25%, and eating peanut oil can reduce the risk of cardiovascular diseases by 265,438+0%. Peanut oil diet is almost the same as olive oil diet, which can play an important role in preventing cardiovascular diseases. In addition, American scientists who study the anti-aging subject of human body have found resveratrol in peanuts, and its content is 908 times that of grapes. This substance is a chemopreventive agent for tumor diseases, and it is also a chemopreventive agent for preventing and treating atherosclerosis and cardiovascular and cerebrovascular diseases. It can effectively prolong the life span of Drosophila melanogaster and yeast, and it is a potential anti-aging natural compound. With the deepening research on peanut and its products, peanut oil, a nutritious and healthy oil, will provide more nutritional protection for people's daily life. Therefore, medical experts suggest that people should eat more high-quality peanuts and peanut oil, less cheese or meat, and use peanut butter instead of butter or cream.