• There are bacteria in food. The more they reproduce the more toxic they become. But it depends on the conditions they are kept in because that affects the rate of growth of the bacteria. So the only way to know exactly how many bacteria you have in the milk is to examine it under a microscope. Or if it smells and/or tastes sour throw it away or use it asap in baking where buttermilk could be used- biscuits, cornbread, muffins etc. Or in a facemask if you're into that sort of thing. For what!it's worth fermented milk is good for your gut bacteria, like yogurt and buttermilk. You can also make farmer's cheese with it if you're into that sort of thing. And lastly it's the amount of bacteria feces in your milk that can poison you. Yes, food poisoning so if you're sensitive to that throw it out.But symptoms could range from nothing to mild stomach cramping or diarrhea to death so if you experience bad digestive issues seek immediate medical attention.
    • Linda Joy
      It's called an expiration date because there is a potential health hazard whereas a best by date usually has more to do with flavor and product rotation.
  • not sure why

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