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The same reason that cheese and sour cream are preserved: all of these products are made from milk that is mixed with various bacterial cultures. These cultures change the milk into a new product in which fermentation occurs instead of spoiling. Fermentation is also the process that preserves wine where fruit juice would spoil.

The microorganisms that exist in fermented products (sourdough bread dough is another) keep the oxygen cycle working to keep the food fresh. Fermentation is an ancient process used by many cultures world wide to create food that has a longer shelf life. Beer uses this process too, as does sourkraut.

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14y ago

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