
Cheese is a perishable food that can spoil and harbour harmful bacteria, which can lead to foodborne illnesses. Knowing when cheese has gone bad is crucial for your health and safety. Each cheese ages and spoils differently, and there are three main attributes to look out for when determining if your cheese has gone bad: smell, appearance, and taste. A spoiled cheese can have a range of visual indicators, including mould growth, discolouration, and a slimy or greasy texture. The smell of spoiled cheese can vary, but it is often described as rancid, sour, or putrid. In terms of taste, spoiled cheese can be bitter, acidic, or unpleasantly sour. However, it is important to note that the type of cheese, storage conditions, and individual sensory perceptions may also influence how bad cheese tastes.
| Characteristics | Values |
|---|---|
| Sight | Mould growth, discolouration, slimy or greasy texture |
| Smell | Pungent, rancid, sour, putrid, ammonia, vinegar |
| Taste | Bitter, acidic, sour, unpleasant aftertaste |
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What You'll Learn
- Bad cheese can taste sour, bitter, acidic, or unpleasantly sharp
- Spoiled cheese can cause food poisoning, with symptoms like vomiting and diarrhoea
- Bad bacteria and mould can grow on cheese stored in humid conditions above 45°Fahrenheit
- A change in cheese's smell, texture, or appearance can indicate spoilage
- Cheaper cheeses may taste weird due to proximity to plastic or artificial additives

Bad cheese can taste sour, bitter, acidic, or unpleasantly sharp
Knowing when cheese has gone bad can be tricky. Each type of cheese ages and spoils differently, so it's important to pay attention to the cheese's appearance, smell, and texture before consuming it. While these factors are good indicators of whether cheese has gone bad, the only way to know for sure is to taste it.
Bad cheese can have an unpleasantly sharp or sour taste. This is often due to the growth of bacteria or the breakdown of proteins and fats in the cheese. Specifically, the presence of ammonia and butyric acid (butanoic acid) in spoiled cheese can result in a bitter or acidic taste. Ammonia is produced by bacteria breaking down proteins, while butyric acid is produced by bacteria breaking down fats. These compounds can give cheese an unpleasantly sharp, sour, or bitter taste.
Ammonia is commonly found in aged or washed-rind cheeses, and excessive amounts can indicate spoilage. It has a strong, pungent smell similar to cleaning products or urine. Butyric acid is more commonly associated with soft, creamy cheeses with high moisture content, such as Brie. While small amounts can be present in aged cheeses like Parmesan, excessive amounts can indicate that the cheese has gone bad.
In addition to tasting bad, spoiled cheese can also cause foodborne illnesses, with symptoms such as vomiting and diarrhoea. Therefore, it is important to use your senses of sight, smell, and taste to determine whether cheese has gone bad and to err on the side of caution if you're unsure.
To prevent cheese from spoiling, it's crucial to store it properly. Cheese should be kept in a dedicated drawer in the refrigerator, like the deli drawer, to maintain the right temperature and humidity. For expensive aged cheeses, it is recommended to use cheese paper or wax paper instead of plastic wrap.
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Spoiled cheese can cause food poisoning, with symptoms like vomiting and diarrhoea
It can be tricky to tell if cheese has gone bad, as each type of cheese ages and spoils differently. However, it is crucial to know how to identify spoiled cheese for your health and safety. Spoiled cheese can harbour harmful bacteria and consuming it can lead to food poisoning.
The three main attributes to look out for when determining if cheese has gone bad are smell, appearance, and taste. A significant change in the smell of the cheese from its normal odour can indicate that it has gone off. Spoiled cheese may have an ammonia smell, similar to cleaning products or urine, due to the breakdown of proteins in the cheese. Other unpleasant odours may be present, such as a pungent, rancid smell caused by the fatty acids produced by bacteria breaking down the fat in the cheese.
In terms of appearance, spoiled cheese may exhibit mould growth, discolouration, and a slimy or greasy texture. As for taste, bad cheese can be bitter, acidic, or unpleasantly sour. If you suspect that the cheese has gone bad, it is best to err on the side of caution and discard it.
Food poisoning caused by spoiled cheese can result in symptoms such as vomiting, diarrhoea, stomach pain, nausea, and fever. These symptoms are your body's way of trying to purge the toxins ingested and return to health. If you experience severe symptoms, such as bloody diarrhoea, persistent diarrhoea, a high fever, or signs of dehydration, it is important to seek medical attention.
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Bad bacteria and mould can grow on cheese stored in humid conditions above 45°Fahrenheit
Cheese is a perishable food that requires specific conditions, such as the right temperature and humidity, to stay fresh. An environment that is too humid and hotter than 45 degrees Fahrenheit can encourage the growth of undesirable bacteria and mould on the cheese.
The presence of bad bacteria and mould on cheese can be detected through changes in its appearance, smell, and taste. Mould growth, discolouration, and a slimy or greasy texture are some visual indicators of spoilage. However, it can be challenging to identify spoilage based solely on appearance, especially for mouldy cheeses like Blue Cheese.
Regarding smell, any significant deviation from the cheese's typical odour could indicate spoilage. Off cheese often emits an unpleasant, rancid, sour, or putrid odour. This is caused by the growth of bacteria or the breakdown of proteins and fats in the cheese. The presence of ammonia, a pungent compound produced by bacterial breakdown of protein, is a common indicator of spoilage.
Taste is a definitive indicator of cheese spoilage. Spoiled cheese can taste sour, bitter, acidic, or simply unpleasant. If the cheese has an off taste, it has likely gone bad.
It is important to note that while some mouldy cheeses can be salvaged by cutting off the visibly affected parts, mouldy cheese, in general, should be discarded. Consuming spoiled cheese can lead to foodborne illnesses, with symptoms including vomiting and diarrhoea. Therefore, when in doubt, it is best to err on the side of caution and discard the cheese.
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A change in cheese's smell, texture, or appearance can indicate spoilage
Cheese is a perishable food that can spoil and harbour harmful bacteria. Consuming spoiled cheese can lead to foodborne illnesses, with symptoms including vomiting and diarrhoea. Therefore, it is important to be able to identify signs of spoilage to ensure you're consuming safe cheese.
A change in a cheese's smell, texture, or appearance can indicate spoilage. Firstly, any significant change in the smell of a cheese from its normal odour can be a sign that it has gone off. Spoiled cheese can smell rancid, sour, or putrid, and in some cases, similar to cleaning products or urine. This is due to the growth of bacteria or the breakdown of proteins and fats in the cheese. For example, the production of ammonia, a common chemical in spoiled cheese, leads to a pungent smell.
Secondly, spoiled cheese can exhibit visual indicators such as mould growth, discolouration, and a slimy or greasy texture. It is important to note that mould can be naturally present in some cheeses, so it is not always a sign of spoilage.
Finally, changes in texture can indicate that cheese has gone bad. A rubbery texture, for example, can be a sign of spoilage.
While changes in smell, texture, or appearance can be indicative of spoilage, taste can also be a determining factor. Spoiled cheese can taste bitter, acidic, or unpleasantly sour. However, it is important to use other indicators before resorting to a taste test, as consuming spoiled cheese can be harmful.
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Cheaper cheeses may taste weird due to proximity to plastic or artificial additives
It can be tricky to tell if a cheese has gone bad, as each type of cheese ages and spoils differently. However, cheaper cheeses may have an odd taste due to the presence of artificial additives or their proximity to plastic.
Cheese is a perishable food, and consuming spoiled cheese can lead to foodborne illnesses. Spoiled cheese can have several indicators, including mould growth, discolouration, and a slimy or greasy texture. In terms of taste, off cheese can be bitter, acidic, or unpleasantly sour. This is due to the growth of bacteria or the breakdown of proteins and fats in the cheese.
Some cheaper cheeses may contain artificial additives, colours, preservatives, and non-specific flavourings. These additives can give the cheese an odd taste. For example, butyric acid, a chemical produced by bacteria breaking down fat in cheese, can give cheese an unpleasant taste. Cheaper cheeses may also have a higher moisture content, making them more prone to spoilage and the development of unpleasant flavours.
Additionally, some affordable cheeses are packaged in plastic, which can affect their taste. Plastic packaging can impart a rubbery texture and an oily consistency to the cheese, detracting from the desired flavour and mouthfeel of the cheese.
To avoid odd-tasting cheese, opt for organic or pure cheese brands that offer high-quality products without artificial additives or ingredients. These cheeses may be more expensive, but they provide a more natural and likely more pleasant tasting experience.
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Frequently asked questions
The best indicators of whether your cheese has gone bad are its smell, appearance, and taste. If your cheese has developed a strong ammonia smell, similar to cat urine, it has likely gone bad. Other signs of spoilage include mould growth, discolouration, and a slimy or greasy texture.
Bad cheese can taste weird due to the growth of bacteria and the breakdown of proteins and fats in the cheese. This can result in an unpleasant, sour, bitter, or acidic taste.
Consuming spoiled cheese can lead to foodborne illnesses, including vomiting and diarrhoea. Therefore, it is important to err on the side of caution and discard any cheese that you suspect has gone bad.
To prevent your cheese from going bad, it is crucial to store it properly. Cheese requires specific conditions, such as the right temperature and humidity, to stay fresh. Avoid storing cheese with moist foods, and pay attention to the refrigerator's temperature. Once opened, keep the cheese in a dedicated drawer or wrap it in cheese paper or wax paper.

























