Does grated Parmesan cheese go bad?

Yes, grated Parmesan cheese can go bad, although it has a longer shelf life than a whole block. Here's why and how to tell if it's gone bad:

Factors Affecting Shelf Life:

* Moisture: Grated cheese has a higher surface area exposed to air, making it more prone to moisture absorption, which can lead to spoilage.

* Packaging: The type of packaging (vacuum sealed, airtight container) significantly affects how long it stays fresh.

* Storage: Proper storage (refrigeration) is crucial for preserving the cheese.

Signs of Spoilage:

* Mold: This is the most obvious sign of spoilage. If you see any mold on the cheese, discard it.

* Off-odor: Grated Parmesan should have a pleasant, nutty aroma. If it smells sour, rancid, or otherwise unpleasant, it's gone bad.

* Texture: The cheese should be firm and slightly crumbly. If it becomes soft, sticky, or mushy, it's likely spoiled.

* Taste: If the cheese tastes bitter, sour, or off, it's gone bad.

Shelf Life:

* Refrigerated: Grated Parmesan cheese can last for 2-3 weeks in the refrigerator if stored properly in an airtight container.

* Frozen: You can extend the shelf life by freezing it. Frozen grated Parmesan can last for up to 6 months.

Tips for Storage:

* Refrigerate: Store grated Parmesan cheese in an airtight container in the refrigerator.

* Freeze: For longer storage, freeze the cheese in a freezer-safe bag or container.

Remember: If you're unsure about the freshness of your grated Parmesan cheese, it's best to err on the side of caution and throw it away.