Soybean oil is not recommended for consumption after the expiration date. Soybean oil expired, not only will make the loss of nutrients, but also may be rancid, and even produce carcinogens, triggering gastrointestinal system discomfort symptoms. Usually, when soybean oil exceeds the shelf life, it is easy to occur loss of nutrients, especially the unsaturated fatty acids, sensors contact with air or light, can be oxidized, losing the original nutritional value. Expired fats and oils may be rancid, edible fats and oils put for a long time, oxygen in the air, sunlight, and the role of microorganisms and enzymes, so that the acid price of fats and oils, carbonyl price and thiobarbituric acid value is too high. Acids, aldehydes, ketones and various oxides produced by rancidity of fats and oils not only change the organoleptic properties of fats and oils, but also have adverse effects on the body. Its high oxidation may have carcinogenic effect. In addition, expired soybean oil, may be bacterial fungi and other microbial contamination, not only can trigger food poisoning, is likely to generate some carcinogenic substances, such as aflatoxin. If consumed over a long period of time, it can easily increase the risk of cancer as well as cause food poisoning. In conclusion, it is not recommended to continue consuming soybean oil after its expiration date. It is not recommended to consume any food after its expiration date.