Elimination diet and the development of multiple tree-nut allergies

Area of Science:

• Allergy and Immunology
• Pediatric Allergy
• Food Hypersensitivity

Background:

• Multiple food allergies are common in children.
• Characteristics of patients with multiple tree nut allergies are not well understood.
• Tree nut avoidance is frequent in multi-food allergic patients.

Purpose of the Study:

• To investigate the characteristics of children with multiple tree nut allergies.
• To evaluate the diagnostic evidence and outcomes of tree nut avoidance in pediatric food allergy.
• To understand the development of sensitization and allergy during elimination diets.

Main Methods:

• Retrospective review of medical records and questionnaires from 60 children (aged 4-15 years) in an oral immunotherapy (OIT) study.
• Assessment of initial allergy evaluation data, including skin prick tests (SPT) and specific IgE (sIgE) levels.
• Oral food challenges (OFCs) performed at OIT enrollment to assess current tolerance to eliminated foods.

Main Results:

• Significantly less initial evidence of acute reaction or positive SPT/sIgE for tree nuts compared to other foods.
• Increased SPT/sIgE levels for tree nuts and peanut over time, indicating developing sensitization.
• Most oral food challenges performed later in the study were positive for tree nuts, despite initial low evidence.

Conclusions:

• Tree nuts are often eliminated without strong initial diagnostic evidence in children with multiple food allergies.
• Sensitization and allergy to tree nuts can develop during prolonged periods of dietary elimination.
• Current diagnostic criteria may need re-evaluation for tree nut allergy in multi-food allergic populations.