Coffee should not be drunk after the expiration date. The shelf life of food refers to the period that can be maintained when stored in a suitable environment, and coffee that has expired may deteriorate and breed bacteria and other pathogenic microorganisms, which may cause vomiting, diarrhea and other gastrointestinal symptoms, and even food poisoning after drinking. The possibility of bacterial growth and reproduction increases significantly after the coffee expires, and because coffee is more dark, it is not easy to distinguish even if it has deteriorated, so it is not recommended to drink coffee after it expires even if its properties have not changed. If only 1-2 days beyond the shelf life, its properties and taste have not changed significantly, some people may not appear significantly abnormal after drinking, but this is a probability event, does not have reference value; and the taste and flavor of expired coffee and nutrients will be damaged to varying degrees, especially once the coffee is opened, the bacteria in the air can invade the coffee, pathogenic bacteria can grow and multiply in the container or bag, so that At this time, drinking coffee may cause gastrointestinal discomfort and harm your health, so it is not recommended. Once the storage conditions are not suitable, it will easily lead to food deterioration, shorten the shelf life of the coffee, and can not continue to drink.