Casein: what is it and where is it found?
When we talk about milk and dairy products, we immediately think of lactose, but not everyone knows that another fundamental component is casein. If you are asking yourself “what is casein and where is it found?”, you are in the right place. In this article, we will discover what it is, where it is found, and why it is useful to know about it, especially for those who care about their digestion.
What is casein?
Definition and role in milk proteins
Casein is the main protein present in mammalian milk. In cow's milk, it accounts for about 80% of total proteins, while the remaining 20% consists of whey proteins. Chemically, casein is organized into micelles, structures that allow for the transport of calcium and phosphorus, two minerals essential for bones and teeth.
But what is the difference between casein and lactose?
People often tend to confuse casein and lactose, but they are two completely different substances. Lactose is a sugar, while casein is a protein. Lactose intolerance is due to a deficiency of the enzyme lactase, not casein. However, in the case of an allergy to milk proteins, it is precisely casein that triggers the reaction.
Want to find out if you are lactose intolerant? Try our innovative breath test.
Where is casein found?
Main dietary sources
Casein is found in all dairy products:
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Cow's and goat's milk
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Aged and fresh cheeses
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Yogurt, especially thick, set-style yogurt
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Milk powder and milk-based preparations
The more concentrated and low-water a dairy food is, the higher its casein content will be. This is why aged cheeses like Parmesan are particularly rich in this protein; conversely, the same cheeses are naturally lactose-free. So, if you feel unwell after eating an aged cheese, it is likely not due to lactose intolerance, but rather a probable allergy to milk proteins.
Casein and lactose intolerance: let’s clarify
Effects of casein on the body
Casein is a slow-digesting protein, meaning it releases amino acids gradually into the bloodstream. This characteristic makes it interesting for athletes, but also for those who want to maintain a feeling of satiety for longer.
If you are lactose intolerant, casein is not the direct cause of your discomfort. However, many foods containing it are also rich in lactose. In these cases, using supplements like Lactosolution can help you digest lactose better, allowing you to enjoy the nutritional benefits of casein without unpleasant symptoms.
When to be careful
Those suffering from a milk protein allergy must avoid casein. Even in the absence of an allergy, some people may find it difficult to digest large quantities of dairy proteins.
How to tell if you are lactose intolerant or allergic to casein?
Symptoms linked to the consumption of milk and dairy products can have different causes. It is important to distinguish them to manage them in the best way possible:
Lactose intolerance:
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Cause: deficiency of the enzyme lactase, which is needed to digest milk sugar (lactose).
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Main symptoms: bloating, abdominal cramps, flatulence, diarrhea, nausea, which generally appear a few hours after ingestion.
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How to find out: breath test or gradual elimination of foods containing lactose to verify the regression of symptoms.
Casein allergy:
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Cause: immune system reaction against the main milk protein.
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Main symptoms: skin rashes, itching, swelling of the lips or throat, breathing difficulties, as well as gastrointestinal distress. Symptoms can appear even with minimal traces of milk.
- How to detect it: allergy tests (prick test or specific IgE blood test) prescribed by an allergist.
Now that you know what casein is and where it is found, you can make more informed food choices. It is a valuable protein, but its presence in foods that contain lactose can make it difficult to consume for those who are intolerant.