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Summary Background Food antigens are clearly implicated in the induction and persistence of eosinophilic oesophagitis. Dietary elimination to identify triggers is tedious and expensive. Alternatives that can mitigate cost and improve patient quality of life during this process are needed. Aims To test the hypothesis that antibodies against foods that trigger eosinophilic oesophagitis are secreted into the oesophageal lumen where they can be collected by oesophageal brushings. Methods We evaluated food‐specific immune responses within brushings in 68 patients undergoing endoscopy (12 controls, 13 resolved eosinophilic oesophagitis and 43 active eosinophilic oesophagitis). Seventeen participants identified their trigger foods via food elimination diets. Immunoglobulin A and immunoglobulin G4 antibodies against the four most common eosinophilic oesophagitis food triggers were measured using the ImmunoCAP assay in the oesophageal brushings. Food‐specific antibody values were compared between active eosinophilic oesophagitis, resolved eosinophilic oesophagitis and controls. Results Patients with active eosinophilic oesophagitis (>15 eosinophils/hpf) demonstrated increased immunoglobulin A and immunoglobulin G4 levels to common eosinophilic oesophagitis triggers compared to controls (327 ± 380 vs 150 ± 130 for immunoglobulin A, and 1534 ± 3346 vs 178 ± 123 for immunoglobulin G4, P < 0.003). Specific trigger foods were associated with elevated immunoglobulin A and immunoglobulin G4 responses compared to foods that did not trigger oesophageal eosinophilia (733 ± 469 vs 142 ± 64, P < 0.001 immunoglobulin A and 2620 ± 3228 vs 526 ± 1050, P < 0.001 immunoglobulin G4). Conclusions Food‐specific antibodies are easily collected along the oesophageal lumen of eosinophilic oesophagitis patients. Further studies are needed to validate our preliminary findings to determine whether these antibodies can be used to guide elimination diet therapy.

Eosinophilic esophagitis (EoE) is an inflammatory condition of the esophagus with rising incidence in children. Owed to potential adverse effects and high costs of EoE medications, strict elimination diets are often employed as a mainstay of long-term EoE therapy in children. Currently, there are no effective tests to pinpoint food protein triggers in children with EoE. Therefore, EoE elimination diets are often broad (including milk, soy, wheat, egg, fish/shellfish, and nuts) and can greatly alter a child's baseline eating habits. Herein, we describe 2 cases of avoidant/restrictive food intake disorder (ARFID) in children with remitted EoE maintained on an elimination diet. We also present comorbidity data on ARFID and diet-treated EoE from our pediatric EoE clinic. This is the first report of disordered eating associated with EoE therapy. As EoE is becoming more common, close monitoring of intake and growth in patients treated with elimination diets will be key.

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