We did an elimination diet suggested by our natropath. We eliminated all high alergy foods for 2 weeks....wheat, corn, nuts, dairy, eggs, citris, bananas, tomatoes, coffee, alcohol. After 2 weeks 1 food is introduced back into the diet .....3x a day for 2 days, and if there is an allergy there will be a reaction. When my daughter introduced wheat almost immediately she developed an ulcer in her mouth. We also discovered other allergies through this diet....It was a real break through for us!