Even after opening, most milk is safe to drink for several days past the use-by or sell-by date. Proper storage and handling may help it stay fresh and safe for longer.
What does expired milk do to you?
Risks of drinking spoiled milk It can cause food poisoning that may result in uncomfortable digestive symptoms, such as stomach pain, nausea, vomiting, and diarrhea. You dont need to worry if you accidentally ingest a small sip of spoiled milk, but avoid drinking it in large — or even moderate — quantities.
Will spoiled milk make you sick?
Note: As long as its pasteurized, sour milk is unlikely to make you sick, Gunders writes, because as milk ages, it becomes more acidic, creating an environment unfriendly to microbes that might cause illness. Raw milk is a different story.]
Why does milk go bad before the expiration date?
If the temperature gets higher than that, bacteria can start to grow in the milk, which is what causes the rotting and the smell. (Though, for what its worth, you can generally leave milk out of the fridge for up to two hours without any serious issues.)
How fast does spoiled milk make you sick?
A small sip of spoiled milk is unlikely to cause symptoms beyond a bad taste. Drinking larger amounts of spoiled milk can cause stomach distress resulting in abdominal cramping, vomiting and diarrhea (like a food-borne illness). In most cases, symptoms caused by drinking spoiled milk resolve within 12-24 hours.