One of the most common questions people have about milk is how long it lasts once it’s been opened. It can be frustrating to reach for a carton of milk, only to find it has gone sour. To help you avoid any unpleasant surprises, here’s a handy guide to milk shelf life.

Why does milk spoil?

Milk spoils due to the presence of bacteria. When milk is left out at room temperature, these bacteria multiply and cause it to go bad. The main culprits are lactic acid bacteria and psychrotrophic bacteria, which thrive in cooler temperatures. It’s important to note that even if milk doesn’t smell or taste sour, it may still contain harmful bacteria.

How long does opened milk last?

The shelf life of opened milk depends on several factors, including the type of milk and how it is stored. Here are some general guidelines:

  • Whole milk: 3-5 days
  • Low-fat milk: 5-7 days
  • Skim milk: 7-10 days
  • Plant-based milk (such as almond or soy milk): 7-10 days

These estimates assume that the milk is stored in the refrigerator at or below 40°F (4°C). It’s important to check the expiration date on the carton as a starting point, but once opened, the clock starts ticking.

How can you tell if milk has gone bad?

There are several signs that indicate milk has gone bad:

  • Sour smell
  • Unusual or off taste
  • Chunky texture or clumps
  • Visible mold

If you notice any of these signs, it’s best to discard the milk to avoid any potential health risks.

How to extend the shelf life of opened milk?

While it’s not possible to completely stop milk from spoiling, there are a few measures you can take to extend its shelf life:

  • Store milk in the coldest part of your refrigerator, usually near the back.
  • Keep the milk container tightly sealed to prevent bacteria from entering.
  • Don’t return unused milk to its original container, as it may introduce new bacteria.
  • Avoid exposing milk to light, as it can cause oxidation and spoilage.

By following these guidelines, you can help ensure your opened milk stays fresh for as long as possible.

Knowing how long opened milk lasts can help prevent wastage and potential health risks. Remember to store your milk properly and check for signs of spoilage before consuming. When in doubt, it’s always better to err on the side of caution and dispose of any milk that appears spoiled. Enjoy your fresh milk while it lasts!

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