Milk Intolerance – Symptoms and Treatment
Milk intolerance refers to adverse reactions to components of milk, most commonly lactose or milk proteins. Affected individuals experience digestive complaints after consuming dairy products.
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Milk intolerance refers to adverse reactions to components of milk, most commonly lactose or milk proteins. Affected individuals experience digestive complaints after consuming dairy products.
What Is Milk Intolerance?
Milk intolerance is an umbrella term for various adverse reactions to cow's milk and dairy products. The two most common forms are lactose intolerance (inability to digest milk sugar) and cow's milk protein allergy (an immune-mediated reaction to milk proteins). Although both conditions can cause similar symptoms, they have different underlying mechanisms and require different management strategies.
Causes
Lactose Intolerance
In lactose intolerance, the small intestine produces insufficient amounts of the enzyme lactase, which is needed to break down lactose (milk sugar) into absorbable components. Undigested lactose passes into the large intestine, where gut bacteria ferment it, producing gases and acids that cause discomfort.
- Primary lactose intolerance: The most common form, genetically determined. Lactase production naturally decreases after infancy.
- Secondary lactose intolerance: Caused by small intestinal diseases (e.g., celiac disease, Crohn's disease) that damage lactase-producing cells.
- Congenital lactose intolerance: A very rare inherited condition in which lactase is absent from birth.
Cow's Milk Protein Allergy
Cow's milk protein allergy is an immune system overreaction to proteins in milk, primarily casein and whey proteins (e.g., lactalbumin, lactoglobulin). It is particularly common in infants and young children, and many children outgrow it by school age.
Symptoms
Symptoms typically appear shortly after consuming milk or dairy products and can vary in type and severity:
- Abdominal pain and cramps
- Bloating and a feeling of fullness
- Diarrhea or loose stools
- Nausea
- In cow's milk protein allergy, additional reactions may include: skin reactions (hives, eczema), runny nose, breathing difficulties, or in rare cases anaphylactic shock
Diagnosis
Diagnosis is established through several methods:
- Elimination diet and oral food challenge: Dairy products are completely avoided, then gradually reintroduced to observe reactions.
- Hydrogen breath test (H2 breath test): The standard diagnostic test for lactose intolerance. After ingesting a defined amount of lactose, hydrogen concentration in exhaled breath is measured.
- Lactase gene test: A genetic test for the most common mutation associated with primary lactose intolerance.
- Blood and skin tests: If cow's milk protein allergy is suspected, specific IgE antibodies in the blood or a skin prick test are used for diagnosis.
Treatment and Dietary Management
Lactose Intolerance
There is no cure, but symptoms can be well controlled:
- Reducing or avoiding lactose-containing foods
- Using lactose-free dairy products
- Taking lactase enzyme supplements before consuming lactose-containing meals
- Many people with lactose intolerance can tolerate small amounts of lactose, especially in aged cheeses or yogurt
Cow's Milk Protein Allergy
A confirmed allergy requires strict avoidance of all cow's milk products. Infants are switched to hypoallergenic or extensively hydrolyzed formula. In cases of severe allergic reactions, carrying an emergency kit with an adrenaline auto-injector is essential.
Ensuring Adequate Calcium Intake
Since dairy products are a key source of calcium, affected individuals should seek alternative calcium sources, such as green vegetables (broccoli, kale), almonds, calcium-rich mineral water, or fortified plant-based milk alternatives (oat, soy, or almond drinks).
References
- World Gastroenterology Organisation (WGO): WGO Practice Guideline - Lactose Intolerance, 2023. Available at: www.worldgastroenterology.org
- 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.
- Misselwitz, B. et al.: Lactose malabsorption and intolerance: pathogenesis, diagnosis and treatment. United European Gastroenterology Journal, 2019.
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