Which food preservation method reduces water activity by removing moisture from food, thereby extending its shelf life?
Dehydration or drying
Dehydration or drying preserves food by directly removing the water content, which lowers water activity and makes the environment inhospitable for microbial growth.
With less free water available, spoilage organisms cannot thrive, which is why dried foods have significantly extended shelf lives.
Salting draws out moisture indirectly through osmosis rather than direct removal, vacuum packing removes air rather than moisture, and freeze storage slows microbial activity through cold rather than removing water, so none of these directly match this description.
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