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Unsterilized dairy products have been used for many thousands of years.
The human G.I. tract is literally a symbiotic relationship with bacteria. We maintain a large culture within our guts which breaks down ingested food to be absorbed. Without this beneficial bacteria, our digestive tract would literally clog and burst.
This is why dairy products have bacteria artificially added back into the product(after it's sterilized for shelf-life of course).
It's quite possible our hunger instincts are partially driven by a feedback mechanism: our guts tell the brain to eat the foods which the bacteria need.
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