Gut 1996 Jul; 39(1) 130-5
Double blind, placebo controlled food reactions do not correlate to IgE allergy in the diagnosis of staple food related gastrointestinal symptoms
In this study, they took patients who exhibited gastrointestinal symptoms in response to foods and did blinded challenge of thes patients along with skin prick testin and RAST testing, classic measures of IgE sensitivities and for the control and atopic group there was no evidence that IgE or classic allergies were involved, suggesting other immune mechanisms were at play.
**The immune reaction is not your classic IgE or Allergic Reaction