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Why Does Swiss Cheese Have Holes?

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Why Does Swiss Cheese Have Holes?

Swiss Cheese Emmentaler

Photo by Jennifer Meier
Question: Why Does Swiss Cheese Have Holes?
Answer: The holes in Swiss cheese come from bacteria that form during the aging process. This specific type of bacteria is unique to Swiss cheeses due to the type of starter used and the specific temperature the cheese wheels are stored at during aging. This bacteria gives off carbon dioxide. The carbon dioxide forms bubbles in the cheese and when the bubbles "pop" holes are created.

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