Spoiled milk should not be drunk, drinking it may cause gastrointestinal discomfort such as diarrhea. The nutritional value of spoiled milk will decline, but also may produce toxic and harmful substances, the human body has a certain degree of harm, so do not drink spoiled milk. Milk is a nutrient-rich food, containing a certain amount of protein, fat, etc., is also a good source of calcium. But once the milk has passed its shelf life, the protein and fat content will slowly deteriorate, resulting in a large number of microbial growth and reproduction. If you drink such expired milk, not only does it not taste fresh, but it will even have a sour and rotten odor. And it is easy to cause acute gastroenteritis symptoms, abdominal pain, nausea, vomiting, diarrhea and so on. When purchasing milk, make sure that it is stored properly to ensure that it is consumed within its shelf life.