Allergy and Asthma: Food Allergies

Area of Science:

• Immunology
• Allergy and Immunology
• Gastroenterology

Background:

• Food allergies are immune-mediated adverse reactions to specific foods, commonly IgE-mediated (urticaria, anaphylaxis) or non-IgE-mediated (gastrointestinal symptoms).
• Oral allergy syndrome, a distinct condition, causes oropharyngeal symptoms from raw fruits/vegetables.
• Distinguishing true food allergies from intolerances (e.g., lactose intolerance) or non-immunologic reactions is crucial due to frequent overreporting.

Purpose of the Study:

• To provide a comprehensive overview of food allergies, including their mechanisms, common triggers, and diagnostic approaches.
• To differentiate between IgE-mediated and non-IgE-mediated food allergies and related conditions like oral allergy syndrome.
• To emphasize the importance of accurate diagnosis, effective management strategies, and preventive measures.

Main Methods:

• Review of existing literature on food allergy mechanisms, clinical presentations, and diagnostic modalities.
• Discussion of diagnostic tools including immunoglobulin E (IgE) skin tests, IgE serum tests, and oral food challenges.
• Analysis of management strategies, focusing on allergen avoidance and emergency treatment protocols.

Main Results:

• Common food allergens include milk, egg, peanut, tree nuts, shellfish, fish, wheat, and soy, primarily causing IgE-mediated reactions.
• Non-IgE-mediated allergies typically present with delayed gastrointestinal symptoms.
• Accurate diagnosis is essential, as food allergies are often misdiagnosed as food intolerances.

Conclusions:

• Effective management of food allergies relies on strict avoidance of trigger foods and patient education.
• Individuals at risk of anaphylaxis require immediate access to injectable epinephrine.
• Preventing adverse reactions involves careful food label reading, preparation, and increased awareness.