
American cheese is a mild cheddar mixed with Colby and sometimes milk and other ingredients. It is often used in burgers and sandwiches and is known for its ultra-smooth texture and orange colour. While it is a popular food item, it is not vegetarian-friendly due to the presence of milk and other animal derivatives. One of the animal derivatives found in American cheese is rennet, which is a complex of enzymes found in the stomach of mammals. Rennet is used as an emulsifier to help blend the different components of the cheese together. However, it is important to note that not all American cheese contains rennet, and there are vegetarian-friendly options available.
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What You'll Learn

Rennet is derived from the stomach lining of calves
Rennet is a complex of enzymes found in the stomachs of mammals. It is derived from the stomach lining of calves and other young ruminants, such as lambs and goats. In the process of cheese production, rennet is used to curdle milk, separating the curds from the whey. The curds are then further processed to create cheese.
American cheese, a mild cheddar mixed with Colby and sometimes milk, often contains rennet. However, whether or not the cheese contains rennet depends on the brand and manufacturer. While some American cheese brands use rennet derived from the stomach lining of calves, others opt for vegetarian or microbial rennet, which is produced by specific types of mould, fungus, or yeast organisms grown and fermented in a laboratory setting.
The use of rennet in cheese production has been a topic of debate among consumers, particularly those who follow a vegetarian or vegan diet. Traditional American cheese, made with rennet derived from animal sources, tends to have a smoother and more consistent melt. On the other hand, vegetarian American cheeses, made without animal-derived rennet, can have a slightly different melting behaviour due to their higher moisture content. They may become oily or greasy when heated, and their texture and flavour may be impacted.
When searching for vegetarian-friendly American cheese, it is important to carefully read the labels. Look for brands that explicitly state they are suitable for vegetarians or are certified vegan. These labels indicate that the cheese is made without animal-derived rennet and may use alternatives such as microbial enzymes or vegetable rennet derived from plants with coagulation enzymes, like cardoon thistle, fig tree bark, or nettles.
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Rennet is a complex of enzymes
Rennet is a complex set of enzymes found in the stomachs of mammals. It is commonly used in cheesemaking to curdle milk and separate the curds from the whey. The curds are then further processed to create cheese. Rennet is an essential ingredient in traditional cheesemaking, and its use can significantly impact the taste, texture, and melting properties of the final product.
Animal rennet, derived from the stomach lining of calves, is composed of about 90% chymosin enzyme and 10% pepsin enzyme. The combination of these enzymes produces a cheese with an enhanced taste. Animal rennet is widely used in traditional cheesemaking, and its use results in a smoother and more consistent melt. However, it is important to note that animal rennet is not suitable for vegetarian or vegan diets.
As a result, alternative forms of rennet have been developed, such as vegetarian or microbial rennet. Microbial rennet, for instance, is produced by specific types of mould, fungus, or yeast organisms grown and fermented in a laboratory setting. While these alternatives are considered vegetarian-friendly, they can impact the final cheese product's texture and flavour. Some people believe that cheese made with animal rennet tastes better and is safer and more natural.
When purchasing cheese, it is important to read the labels carefully, especially for those with dietary restrictions. Vegetarian cheeses, for example, will explicitly state that they are suitable for vegetarians and are made without animal-derived rennet. Additionally, vegan-certified cheeses assure consumers that the product is entirely free from any animal-derived ingredients and has not been tested on animals.
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Rennet is used to curdle milk
Rennet is a complex of enzymes found in the stomach of mammals. It is used in the cheese-making process to curdle milk. The milk is curdled, and the curds are separated from the whey. The curds are then further processed to create cheese. Rennet is typically derived from the stomach lining of calves, and it is considered an animal derivative. This means that cheese containing rennet is not suitable for vegetarians or vegans.
American cheese is made with milk, emulsifiers, and sometimes other additives. These emulsifiers are often derived from animal sources, such as rennet or gelatin. Rennet is used to give American cheese its characteristic ultra-smooth texture and enhance its taste. The cheese also often contains gelatin, which is derived from animal tissues, and annatto, a natural food colouring that gives the cheese its orange hue.
Some manufacturers use vegetarian rennet or microbial enzymes as an alternative to animal rennet in American cheese. These alternatives can affect the melting behaviour of the cheese, resulting in a less smooth or even melt and a higher moisture content. They may also impact the overall texture and flavour of the final product.
It is important to note that cheesemakers in the United States are not required to specify on their labels if animal rennet is used. Therefore, it is essential to carefully read the labels and look for cheese brands that explicitly state they are suitable for vegetarians or vegans. These labels indicate that the cheese is made without animal-derived rennet.
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Rennet is not always listed as an ingredient
Animal rennet is commonly used in traditional American cheese, and it is derived from animal sources. However, vegetarian versions of American cheese are made without animal rennet and instead use vegetarian rennet or microbial enzymes. These vegetarian options often have a higher moisture content, which can affect their melting properties. They may not melt as smoothly or evenly as traditional American cheese and can sometimes become oily or greasy when heated.
When searching for vegetarian American cheese options, it is important to carefully read the labels. Look for cheese brands that explicitly state they are suitable for vegetarians or are certified kosher. These labels usually indicate that the cheese is made without animal-derived rennet. Additionally, pay attention to other ingredients that may not be vegetarian-friendly, such as gelatin or animal-based colourings.
While there are vegetarian options available, it is worth noting that animal rennet is considered to produce a safer and more natural final cheese product with an enhanced taste.
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Vegetarian rennet is derived from plants
Rennet is a complex of enzymes found in the stomach of mammals. The most common form of rennet traditionally used in cheesemaking is derived from the lining of the fourth stomach of a young ruminant, generally a calf. The traditional method of harvesting animal rennet involves dicing the cleaned and dried stomach, then soaking it in whey or salted water. This mixture may also include vinegar or wine. After a few days, it is filtered, and animal rennet is obtained.
However, animal rennet is not a vegetarian substance as it cannot be extracted from live animals. The animals involved in the production of animal rennet need to be slaughtered, which makes it non-vegetarian. Therefore, vegetarian rennet, derived from plants, is used as an alternative. Different types of vegetarian rennet include microbial rennet, plant rennet, and vegetable rennet. Microbial rennet is derived from molds that can produce a coagulating enzyme and are considered vegetarian-friendly. However, they have a reputation for occasionally causing bitterness, especially in aged cheeses.
Plant rennet is derived from plants with coagulating properties, and the use of plant material in cheesemaking is quite traditional. For example, the Extremadura region of Spain uses the cardoon thistle to coagulate their traditional "tortas". Similarly, Portuguese cheeses like Zimbro also use the cardoon thistle for coagulation. Other examples of cheeses that use plant rennet include Irish cheeses such as Cashel Blue and Ardrahan. When specified, plant-based rennet is usually labelled as "thistle rennet", "plant rennet", or "vegetarian rennet".
Vegetarian rennet derived from plants performs differently from animal rennet. For instance, vegetarian American cheeses made without animal rennet have a higher moisture content, which affects their melting properties. They may not melt as smoothly or evenly and can become oily or greasy when heated.
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Frequently asked questions
American cheese often contains rennet, which is derived from animal sources. Rennet is a complex of enzymes found in the stomach of mammals. However, vegetarian versions of American cheese are available, which are made without animal rennet.
To determine if American cheese contains rennet, carefully read the product labels. Look for brands that explicitly state they are suitable for vegetarians. These labels usually indicate that the cheese is made without animal-derived rennet.
Vegetarian rennet or microbial enzymes derived from plants, molds, fungi, or yeast organisms are used in place of animal rennet in vegetarian American cheese.
Traditional American cheese made with animal rennet tends to have a smoother and more consistent melt. On the other hand, vegetarian American cheese made without animal rennet may not melt as smoothly or evenly and can sometimes become oily or greasy when heated due to its higher moisture content.
























