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Allergen Introduction – Preventing Food Allergies in Infants

Allergen introduction refers to the deliberate early introduction of allergenic foods to infants to help prevent the development of food allergies.

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Things worth knowing about "Allergen introduction"

Allergen introduction refers to the deliberate early introduction of allergenic foods to infants to help prevent the development of food allergies.

What is Allergen Introduction?

Allergen introduction refers to the intentional, age-appropriate introduction of potentially allergenic foods into an infant's diet, typically starting from around 4 to 6 months of age. The goal is to train the developing immune system to tolerate common food allergens and thereby reduce the risk of developing food allergies later in life. This approach has become a cornerstone of modern pediatric nutrition and allergy prevention.

Scientific Background

For many years, health guidelines recommended delaying the introduction of highly allergenic foods such as peanuts, eggs, and wheat to reduce allergy risk. However, landmark research -- most notably the LEAP study (Learning Early About Peanut Allergy) -- demonstrated that early and regular exposure to allergenic foods can significantly reduce the likelihood of developing an allergy. The infant immune system has a critical window during which oral tolerance can be most effectively established.

Common Allergens to Introduce

The most important food allergens for which early introduction is recommended include:

Peanuts (e.g., in the form of peanut butter or peanut powder)
Hen's egg (well cooked)
Cow's milk and dairy products
Wheat and other gluten-containing cereals
Sesame
Fish and shellfish
Soy
Tree nuts (e.g., almonds, cashews, walnuts)

Recommendations for Practice

Current guidelines from organizations such as the World Allergy Organization (WAO) and national allergy societies recommend:

Introducing allergenic foods from around 4 to 6 months of age, in line with the readiness for complementary feeding.
Avoiding unnecessary delays in allergen introduction in healthy infants without allergy symptoms.
Starting with small amounts and gradually increasing portions if the food is well tolerated.
Offering allergenic foods regularly to maintain and strengthen oral tolerance.
For infants with existing eczema (atopic dermatitis) or known allergy risk factors, introduction should be supervised by a healthcare professional.

High-Risk Infants

Some infants are at increased risk of developing food allergies and require extra caution during allergen introduction. These include children with:

Severe atopic dermatitis (eczema)
A known allergy to another food protein
A strong family history of allergic disease

In these cases, it is recommended that allergen introduction be carried out under medical supervision, so that any potential allergic reaction can be promptly identified and managed.

Distinction from Immunotherapy

Preventive allergen introduction should not be confused with oral allergen immunotherapy (OIT), which is used as a treatment in children who already have a diagnosed food allergy. While early introduction aims to prevent allergy development, OIT targets desensitization in those with an established allergy.

References

Du Toit G et al. - Randomized Trial of Peanut Consumption in Infants at Risk for Peanut Allergy (LEAP Study). New England Journal of Medicine, 2015.
World Allergy Organization (WAO) - WAO Guidance on Allergen Immunotherapy and Prevention of Allergic Disease in High-risk Infants, 2022.
Togias A et al. - Addendum Guidelines for the Prevention of Peanut Allergy in the United States. Journal of Allergy and Clinical Immunology, 2017.

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