Diagnosis and Management of Food Protein-Induced Allergic Proctocolitis

Area of Science:

• Pediatric Gastroenterology
• Allergy Immunology
• Clinical Nutrition

Background:

• Food protein-induced allergic proctocolitis (FPIAP) is a common cause of infant rectal bleeding.
• Current diagnostic and management practices for FPIAP vary widely, leading to overdiagnosis and unnecessary dietary restrictions.
• Disruption of breastfeeding is a significant concern associated with current FPIAP management.

Purpose of the Study:

• To review current evidence for a pragmatic, challenge-anchored approach to FPIAP diagnosis and management.
• To guide clinicians in minimizing overdiagnosis and unnecessary dietary restrictions in FPIAP.
• To support continued breastfeeding and optimal infant nutrition.

Main Methods:

• Clinical diagnosis based on symptom resolution after food elimination and recurrence upon reintroduction.
• Review of contemporary evidence on diagnostic biomarkers and management strategies.
• Emphasis on challenge-proven FPIAP for dietary interventions.

Main Results:

• Confirmatory challenges for FPIAP are infrequently performed, despite being the gold standard.
• Proposed biomarkers (fecal calprotectin, eosinophil-derived neurotoxin, zonulin, microbiome signatures) lack reliability for clinical use in infants.
• Least restrictive diets (maternal elimination, hydrolyzed formulas) are recommended only for challenge-proven FPIAP.
• Earlier reintroduction of trigger foods and introduction of other allergens may reduce future allergy risk.
• A standardized, challenge-confirmed approach minimizes over-restriction and supports breastfeeding.

Conclusions:

• A challenge-anchored diagnostic framework is crucial for accurate FPIAP diagnosis and management.
• Least restrictive dietary interventions should be reserved for confirmed FPIAP cases.
• Future research should focus on validating non-invasive biomarkers and optimizing dietary reintroduction strategies.