Food Safety Guide: When Mouldy Cheese Can Be Eaten Or Discarded
Experts explain when mouldy cheese is safe and when it should be discarded.
Mould on cheese is a common kitchen concern that often leaves consumers unsure whether the food is still safe to eat or should be discarded. While mould growth can look alarming in shades such as green, blue, white, black, pink, or orange, food safety experts note that the key factor is whether the mould is intentionally introduced during production or has developed due to spoilage.
Mould is a naturally occurring fungus that spreads through airborne spores and thrives in moist environments, making food storage conditions particularly important. In cheesemaking, certain moulds are deliberately cultivated to develop flavour, texture, and appearance. Examples include blue cheeses such as Roquefort, Gorgonzola, Stilton, and Danish Blue, which use the safe mould Penicillium roqueforti, as well as soft-ripened cheeses like Brie, which develops a white edible rind from Penicillium camemberti.
However, mould that appears unexpectedly on cheese after storage is generally considered a sign of spoilage. Such growth can occur when cheese is exposed to air, moisture, or contamination over time. In these cases, the mould may produce harmful compounds such as mycotoxins, which can pose a risk of foodborne illness, making careful assessment essential before consumption.
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Whether mouldy cheese can still be safely eaten depends largely on its moisture content and type. Hard cheeses such as cheddar, parmesan, Swiss, and gruyère are less prone to deep contamination due to their low moisture levels. In such cases, it is often considered safe to cut away the mould along with at least an inch of surrounding cheese, provided clean utensils are used to avoid cross-contamination.
Soft cheeses, on the other hand, present a higher risk because their high moisture content allows mould to spread internally even when not visible on the surface. Products such as cream cheese, ricotta, mozzarella, burrata, and mascarpone are generally advised to be discarded entirely if mould appears. Similarly, shredded or crumbled cheeses can allow mould to spread easily between pieces, increasing contamination risk.
Even for mould-ripened cheeses like Brie and blue cheese, not all visible mould is safe. If these cheeses develop unusual colours such as black or pink patches, or if they emit a foul or rotten odour, it is a strong indication of spoilage. In such cases, food safety guidance suggests discarding the product rather than consuming it, as the balance of controlled mould may have been compromised.
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