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Because the bacteria that caused the fermentation isn't one that attacks humans, or creates dangerous waste byproducts. Lactobacillus acidophilus is a classic example. It's presence in milk/cream is what makes yogurt. What's more Lactobacillus actually creates enzymes which aid in human digestion. Not all bacteria are harmful to humans, and in fact we are host to a wide variety of internal and external bacteria that not only don't hurt us, but help us. It's not at all uncommon for one strain of benevolent bacteria to attack and destroy other strains that may be dangerous to you.

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16y ago

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