While vacuum packing can help extend the shelf life of certain foods, leaving a solid block of cheddar cheese outside the refrigerator overnight, even if vacuum packed, is not recommended. Cheddar cheese is a perishable dairy product and is prone to bacterial growth and spoilage when left at room temperature for an extended period.
Vacuum packing creates a low-oxygen environment that can slow down the growth of some bacteria, but it does not eliminate the risk entirely, especially when it comes to dairy products. Harmful bacteria can still multiply at a slower rate in such conditions, and there's a higher chance of spoilage and potential foodborne illness.
To ensure the safety and quality of the cheddar cheese, it's best to refrigerate it promptly. If you accidentally left it out overnight, it's safer to discard it rather than risk consuming cheese that may have been compromised. Cheese can be expensive, but food safety should always be a priority to avoid health issues. When in doubt, it's better to be cautious and opt for fresh and properly stored cheese.