Olive oil expired 3 months unopened, can not be eaten. Olive oil is a vegetable oil, which is rich in vitamins, unsaturated fatty acids, and trace elements, etc. Proper consumption can supplement the nutrients needed by the human body. The nutritional value of expired olive oil decreases, there will be some odor, easy to breed bacteria and toxins. Consumption after the expiration date will cause fatty acid failure and deterioration. After eating may have an impact on the gastrointestinal function, easy to lead to gastrointestinal dysfunction, vomiting, diarrhea, abdominal pain and so on. Expired olive oil due to the longer time, may produce some material deterioration, deterioration of the goods will produce mold, aflatoxin may exceed the standard. Aflatoxin has been found to be a class 1 carcinogen and is very closely related to the development of liver cancer.