Food expiration refers to the quality of the food and its role in the change, the loss of the original role or even change, contains a certain amount of harmful substances. Some medical items will lose their function after the expiration date and some of them will be poisonous, which is due to the chemical changes of the substances inside, sometimes not related to microorganisms. Foods and other foodstuffs generally deteriorate because microorganisms change their substances. Some are not, such as potatoes, in the green, because it green parts will produce toxins, and very toxic. Penalties for expired food in two kinds: (a) the production and operation of expired food, by the competent authorities in accordance with their respective division of responsibilities, confiscate the illegal income, illegal production and operation of food and for the illegal production and operation of tools, equipment, raw materials and other items; illegal production and operation of food less than 10,000 yuan of the value of the amount and impose a fine of more than 2,000 yuan of 50,000 yuan; value of the amount of 10,000 yuan of the amount of more than 10,000 yuan of the amount of the amount of a fine of more than five times the amount of 10 times the amount of the amount of the value of the food and impose The amount of more than ten times the amount of five times the following fine; the circumstances are serious, revocation of license. (b) The sale of expired food, the consumer in addition to compensation for damages, but also to the producer or seller can demand payment of compensation of more than ten times the price. Theoretically, more than the shelf life of the food should not be consumed, but there is no absolute regulation, if the shelf life, generally in the food storage conditions up to standard, packaging intact, color and flavor has not changed under the premise of the food can also be consumed. However, for their own health considerations, expired food or do not try to eat.