Drinking milk past its expiration date may lead to food poisoning because of the bacteria that grows in the milk and makes it sour. Symptoms of food poisoning include nausea, stomach cramps, fever and diarrhea.
The chance of getting food poisoning from drinking milk past its expiration date increases in the case of raw milk. Because the pasteurization process decreases the chances of bacteria developing, drinking raw milk can be dangerous, according to FoodSafety.org. An unusual smell and texture lets individuals know that a bottle or carton of milk has gone bad, so this may prevent its consumption and keep people from developing food poisoning.