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Why Do Some Cheeses Have Holes?

Although you may have been told as a kid that the holes in cheese come from a tiny mice chewing through it, the holes actually come from carbon dioxide that is produced during the cheesemaking process. Swiss, Emmental, and other alpine-style cheeses are made with Propionibacterium freundenreichii bacteria, which produces carbon dioxide, forming small air pockets as the cheese hardens.

Swiss cheese.


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