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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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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