title: Food-specific IgG4-guided exclusion diets improve symptoms in Crohn's disease: a pilot study.
abstract: OBJECTIVE
  Exclusion diets have been shown to prolong remission in Crohn's disease (CD). We assessed IgG4-targeted exclusion diets in patients with CD.
  
  
  METHODS
  Forty patients with symptomatic CD were recruited. Their sera were tested for IgG4 antibodies to 14 specific food antigens and each subject's four most reactive foods were excluded for 4 weeks. Disease activity was assessed using a modified CD activity index (mCDAI). Questionnaire and inflammatory markers were measured before and on completion of the exclusion diet.
  
  
  RESULTS
  Eleven patients did not complete the study, leaving 29 for analysis. Of these, 26 (90%) reported symptomatic improvement with a reduction in mCDAI from a mean of 171-97.5 (P = 0.0001). The ESR fell from 23 to 17 mm/h (P = 0.021) and the IgG4 titres for the excluded foods fell from a mean of 3015-2306 mcgA/l (P = 0.003).
  
  
  CONCLUSIONS
  IgG4-guided exclusion diets resulted in significant symptomatic improvement with an objective fall in an inflammatory marker. This approach may be useful in clinical practice.
authors.affiliation: St George's Hospital, London, UK.
authors.forename: N
authors.initials: N
authors.lastname: Rajendran
authors.forename: D
authors.initials: D
authors.lastname: Kumar
mesh_terms: D000293:Adolescent; D000328:Adult; D001799:Blood Sedimentation; D003424:Crohn Disease / Q000097:blood / Q000178:diet therapy* / Q000276:immunology*; D005260:Female; D005512:Food Hypersensitivity / Q000276:immunology* / Q000517:prevention & control; D006801:Humans; D007074:Immunoglobulin G / Q000097:blood*; D008297:Male; D008875:Middle Aged; D010349:Patient Compliance; D010865:Pilot Projects; D012720:Severity of Illness Index; D055815:Young Adult
chemical_list: D007074:Immunoglobulin G