Shelf life of six months of milk expired is best not to drink, so as not to cause adverse effects on the organism. The shelf life of milk is mainly due to the use of ultra-high temperature sterilization technology, expired milk is easy to deteriorate, or breeding bacteria, after drinking may cause gastrointestinal discomfort, such as nausea, abdominal pain, diarrhea and so on. In addition, expired milk nutrients are different degrees of loss, drinking at this time, it is difficult to play for the body to supplement the role of nutrients, so expired milk is best not to drink. Milk itself is a natural beverage with a short shelf life, it is advisable to drink fresh milk or milk within the shelf life, pay attention to dietary safety and hygiene, and try to avoid eating spoiled or expired food.