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Sourdough Bacteria Pump Out Mold Killers

As many San Franciscans have noticed, sourdough bread stays fresher longer than the regular stuff. Sourdough’s extended freshness is due to extra fermentation that traps more moisture in the dough. But now we know that sourdough’s longevity is also because it can ward off mold. Because bacteria in some sourdough starters actually produce mold-killing compounds—essentially natural preservatives.

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