Milk can spoil even before the expiration date if it is stored incorrectly. Knowing the early signs helps avoid drinking milk that may cause digestive issues or food poisoning.
How to tell if milk has spoiled
Milk is spoiled if it smells sour, tastes unpleasant, or has a thick or lumpy texture.
Clear signs milk is no longer safe
Fresh milk has a neutral, slightly sweet smell. When bacteria grow, noticeable changes appear.
- Sour or sharp acidic smell
- Thickened texture or visible lumps
- Yellowish tint instead of white
Is sour milk always spoiled
Milk can naturally sour over time, but this does not make it safe to drink. Pasteurized milk should never smell or taste sour.
If milk smells off immediately after opening, it should be discarded.
Common mistakes people make
- Drinking milk based only on the date on the carton.
- Shaking spoiled milk and assuming it is fine.
- Storing milk in the fridge door where temperature fluctuates.
Conclusion
If milk smells sour or looks lumpy, it is unsafe to drink. When in doubt, throw it away.