Olive oil is better than salad oil. Olive oil is the main edible oil in Mediterranean countries. It is characterized by a particularly high content of "oleic acid", accounting for 80% of the total fatty acids. Medical experts have found that although people in Mediterranean countries consume a lot of animal fat, there are few patients with cardiovascular diseases. It is found that oleic acid is at work: it reduces the harmful "low density lipoprotein cholesterol" in human blood, while retaining the beneficial "high density lipoprotein cholesterol". Salad oil, the first-class oil of new standard, is the edible oil with the highest processing level. Its characteristic is that it can be cooked or cold. At present, the varieties of salad oil on the market are: soybean salad oil, rapeseed salad oil, cottonseed salad oil, peanut salad oil, sunflower seed salad oil, rice bran salad oil and so on.