Can Fermented Go Bad?

Smell: Fermented food should smell good. Even after fermenting for a few months, kombucha should smell like really strong kombucha. ... If the food smells rotten, moldy or bad, then throw it out. Taste: If the ferment doesn't taste like you expect, or if it doesn't taste good, then it's probably gone off.

How do I know if my fermentation is bad?

Signs Something Is Wrong With Your Ferment:
  1. It's moldy. Pink or fuzzy is not good.
  2. It's mushy. Who wants mushy pickles or kraut?
  3. Its smell repels you because it's putrid or rotten, not just sour. Your nose KNOWS this!
  4. When you taste it, it gives you an upset stomach. (Don't confuse this with a healing reaction though.)

Does fermented mean spoiled?

Obviously, it's not exactly appealing to call food out as being rotten, so there's a more common term for it: fermented. Fermentation simply means giving bacteria time to do their thing; if it's bad bacteria you can end up with food poisoning, but if it's good bacteria you end up with pickles.

James H. Sterling

James H. Sterling

Environmental Science & Climate Journalist

James Sterling reports on renewable energy developments, climate policy, ecological conservation, and green tech innovations around the globe.