EoE Food Test Pilot Study

Inclusion Criteria: Diagnosis of Eosinophilic esophagitis (EoE) based on positive esophageal biopsy (\>15 eosinophils/high power field) within three months of enrollment. AND Intention to undergo dietary intervention for treatment of their EoE. AND Unknown contribution of one or more of milk, soy, egg, and wheat to their EoE disease state. AND Willingness to adopt an elimination diet based in part on the results of the experimental testing. Exclusion Criteria: Proton pump inhibitor (PPI)-responsive EoE: Resolution or response of EoE to high-dose PPI (2 mg/kg) alone, at the PI's discretion. OR Presence of other inflammatory or infectious gastrointestinal pathology (e.g. eosinophilic gastrointestinal diseases, irritable bowel disease, Infectious Colitis, etc.), at the discretion of the Principal Investigator (PI). OR Prior medical or surgical history that precludes safely performing an upper endoscopy with biopsy or restriction of diet. OR Current immunomodulatory therapy \>4 weeks (swallowed or systemic steroids, biologic therapy, chemotherapy. etc.) that may interfere with the blood test or biopsy results, at the PI's discretion. OR Inability to read or understand English.