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Milk Protein: Definition, Function & Allergy

Milk protein refers to the proteins found in milk, primarily casein and whey proteins. It is a high-quality nutrient but can cause allergies or intolerances in some individuals.

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Things worth knowing about "Milk protein"

Milk protein refers to the proteins found in milk, primarily casein and whey proteins. It is a high-quality nutrient but can cause allergies or intolerances in some individuals.

What is milk protein?

Milk protein refers to all proteins naturally present in the milk of mammals – most commonly cow's milk in the human diet. Proteins are essential nutrients made up of amino acids that perform a wide range of functions in the body, including building muscle tissue, supporting the immune system, and enabling growth and repair processes.

Cow's milk contains approximately 3.2% protein by weight. There are two main protein groups:

Caseins (approximately 80% of milk protein): These proteins are heat-stable and form the characteristic curds used in cheese production.
Whey proteins (approximately 20% of milk protein): These include beta-lactoglobulin, alpha-lactalbumin, and immunoglobulins. They are highly water-soluble and become denatured when heated.

Biological functions

Milk protein provides all essential amino acids – those that the human body cannot produce on its own and must obtain through food. This makes it a high-quality, complete protein with a high biological value.

Supports muscle growth and maintenance
Promotes bone health in combination with calcium
Contributes to immune function through whey immunoglobulins
Supplies the body with amino acids for growth and tissue repair

Dietary sources

Milk protein is naturally found in all dairy products:

Cow's milk, goat's milk, sheep's milk
Cheese (hard cheeses such as Parmesan are especially protein-rich)
Yogurt, quark, cottage cheese
Butter (very low protein content)
Whey and whey protein powder (commonly used as dietary supplements)

Recommended intake

The World Health Organization (WHO) recommends a general protein intake of approximately 0.8 g of protein per kilogram of body weight per day for adults. Dairy products can contribute significantly to meeting this recommendation. Athletes and older adults often have higher protein requirements.

Milk protein allergy and intolerance

Not everyone tolerates milk protein equally well. It is important to distinguish between two different types of reactions:

Milk protein allergy (cow's milk allergy)

In a cow's milk allergy, the immune system reacts excessively to specific proteins in milk, most commonly beta-lactoglobulin or casein. This allergy occurs primarily in infants and young children and is one of the most common food allergies in childhood. Symptoms can include:

Skin reactions (eczema, hives, redness)
Gastrointestinal symptoms (vomiting, diarrhea, abdominal pain)
Respiratory symptoms (nasal congestion, asthma)
In rare cases: anaphylactic shock (a life-threatening allergic reaction)

People with a cow's milk allergy must avoid all products containing milk protein. Medical diagnosis and advice from a qualified nutrition professional are strongly recommended.

Lactose intolerance (not a protein intolerance)

Lactose intolerance is not a milk protein intolerance but rather an inability to digest lactose (milk sugar). People with lactose intolerance can often consume lactose-free dairy products or hard cheeses without problems, as these contain little or no lactose while retaining their milk protein content.

Milk protein in sports nutrition

Milk protein – particularly whey protein and casein – is widely used in sports nutrition. Whey protein is rapidly digested and is especially beneficial after exercise for muscle recovery. Casein is digested more slowly and provides a sustained release of amino acids, making it a popular choice for consumption before sleep.

Food labelling

Milk protein is one of the 14 major allergens that must be clearly declared in the ingredient list of packaged foods under EU food labelling regulations. Consumers with a cow's milk allergy should read labels carefully and look for terms such as “contains milk”, “caseinate”, or “whey protein”.

References

World Health Organization (WHO) – Protein and Amino Acid Requirements in Human Nutrition. WHO Technical Report Series, No. 935 (2007). Available at: www.who.int
Fiocchi, A. et al. – World Allergy Organization (WAO) Diagnosis and Rationale for Action against Cow's Milk Allergy (DRACMA) Guidelines. Pediatric Allergy and Immunology, 2010. PMID: 20618740
European Food Safety Authority (EFSA) – Scientific Opinion on the safety of milk proteins. EFSA Journal, 2012. Available at: www.efsa.europa.eu

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