It is common for milk to expire and spoil, but many children and even adults may inadvertently consume expired and spoiled milk without realizing it. So, what happens when you drink spoiled milk?
What happens when you drink spoiled milk
If the milk has only recently expired and spoiled for a few days, drinking it usually does not cause any adverse reactions. However, individuals with digestive disorders or weaker immune systems may experience symptoms such as stomach pain and diarrhea. If the spoiled milk is more severe (sour or foul-smelling), mild symptoms may include stomach pain and diarrhea, while more severe cases can lead to gastrointestinal inflammation and even life-threatening complications.
The composition of spoiled milk
When milk is left for an extended period, bacteria start to multiply, breaking down lactose and producing lactic acid, which increases the acidity of the milk. The protein in milk begins to denature and coagulate under this acidic condition.
The process of milk spoilage
Milk spoilage generally goes through several stages: in the initial stage, there is a slight sour taste and a few bubbles, but no obvious sour or rotten smell; in the middle stage, the sour taste becomes stronger, the liquid thickens, and the smell starts to deteriorate; in the later stage, it develops a rancid smell, the components of the milk clump together, and the color darkens.
Causes of milk spoilage
1. Lack of proper sealing (airborne dust can contaminate the milk and promote spoilage; bacteria and fungi in the milk can grow and multiply, causing spoilage).
2. Using non-fresh milk or adding additives during milk processing can lead to spoilage.
3. High temperatures during the summer can cause milk to spoil.
4. Excessive humidity or dryness in the air can also lead to milk spoilage.
How to identify spoiled milk
To determine if milk has spoiled, you can heat it. If there is sediment or curdling resembling tofu, the milk has spoiled.
Note: This method is suitable for fresh milk, high-calcium milk, and flavored milk beverages. It is not recommended for yogurt and lactobacillus drinks.
Moreover, aseptic milk stored at room temperature can also develop defects, such as bulging or sour packaging, and the content may become curdled or separated into watery residue.
