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Cow´s Milk Protein Intolerance – Causes, Symptoms, Treatment

Cow´s milk protein intolerance is an immune-mediated reaction to proteins found in cow´s milk. It commonly affects infants and can cause digestive, skin, and respiratory symptoms.

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Things worth knowing about "Cow´s Milk Protein Intolerance"

Cow´s milk protein intolerance is an immune-mediated reaction to proteins found in cow´s milk. It commonly affects infants and can cause digestive, skin, and respiratory symptoms.

What is Cow´s Milk Protein Intolerance?

Cow´s milk protein intolerance (CMPI) is an abnormal immune response to specific proteins found in cow´s milk, primarily casein and whey proteins such as beta-lactoglobulin and alpha-lactalbumin. It is one of the most common food allergies in infancy and early childhood, affecting approximately 2 to 7 percent of all infants. Reactions can be IgE-mediated (immediate, allergic) or non-IgE-mediated (delayed, typically gastrointestinal).

Causes

The exact causes of cow´s milk protein intolerance are not yet fully understood. Known contributing factors include:

Genetic predisposition: Children with a family history of allergies are at higher risk.
Immature immune system: In infants, the gut barrier is not yet fully developed, making it easier for food antigens to pass through.
Early exposure to cow´s milk proteins: Particularly in premature infants or those introduced to cow´s milk-based formula early.
Alterations in gut microbiome: A disrupted gut flora composition may interfere with the development of oral tolerance.

Symptoms

The symptoms of cow´s milk protein intolerance are diverse and may affect multiple organ systems:

Gastrointestinal Symptoms

Frequent vomiting or regurgitation
Diarrhea or constipation
Bloating and abdominal pain or cramping
Blood in stool (in non-IgE-mediated forms)
Failure to thrive (inadequate weight gain)

Skin Reactions

Atopic eczema (atopic dermatitis)
Urticaria (hives)
Angioedema (swelling beneath the skin)

Respiratory Symptoms

Runny nose, sneezing
Wheezing or noisy breathing
In rare cases: anaphylactic reactions (in IgE-mediated forms)

Diagnosis

Diagnosing cow´s milk protein intolerance requires careful medical history and targeted investigations:

Elimination diet: Complete avoidance of cow´s milk protein for 2 to 4 weeks. Breastfeeding mothers are advised to follow a cow´s milk protein-free diet.
Oral food challenge: Controlled reintroduction of cow´s milk protein under medical supervision is considered the gold standard.
Skin prick test and specific IgE testing: Used to identify IgE-mediated allergic reactions.
Stool testing: Performed when occult bleeding or signs of intestinal inflammation are suspected.

Treatment

The only proven treatment is the strict avoidance of cow´s milk proteins:

Dietary Management

For breastfed infants: The breastfeeding mother eliminates all cow´s milk and dairy products from her diet. Calcium and vitamin D supplementation for the mother is recommended.
For formula-fed infants: Transition to an extensively hydrolyzed formula (eHF), in which milk proteins are broken down into small fragments.
For severe reactions: Amino acid-based elemental formula, which contains no intact proteins, is recommended.
Soy-based formula: May be considered as an alternative from 6 months of age, but cross-reactivity with soy proteins occurs in up to 50 percent of affected infants.

Prognosis

The prognosis of cow´s milk protein intolerance in children is generally favorable. The majority of affected children develop tolerance to cow´s milk proteins by 3 to 5 years of age. In IgE-mediated forms, the development of tolerance may take longer.

References

Koletzko S. et al. - Diagnostic Approach and Management of Cow's-Milk Protein Allergy in Infants and Children. Journal of Pediatric Gastroenterology and Nutrition, 2012.
World Allergy Organization (WAO) - Diagnosis and Rationale for Action against Cow Milk Allergy (DRACMA) Guidelines, 2010. Available at: www.worldallergy.org
Fiocchi A. et al. - World Allergy Organization (WAO) Diagnosis and Rationale for Action against Cow's Milk Allergy (DRACMA) Guidelines Update. World Allergy Organization Journal, 2022.

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