Abstract
Background
Food-associated complaints in the gastrointestinal tract can be signs of an intolerance of different etiology, which is reported by almost a quarter of the population. Due to the unspecific symptoms, a whole range of different triggers and immune reactions can be considered for the differential diagnosis, which cannot always be determined unambiguously and quickly.
Differentiation and diagnosis of disease entity
The time course in connection with the clinical picture already allows a rough estimation of the underlying pathomechanism and points the diagnostic way. Thus, immune-mediated clinical pictures such as allergy must be distinguished from nonimmune-mediated intolerances. An allergic reaction can be IgE-mediated or cellularly induced. Secondary food allergies are triggered by other allergens than primary allergies, differ in their sensitization routes and course of disease. Non-immunological intolerance reactions also play a not insignificant role, including carbohydrate utilization disorders and histamine intolerance in addition to toxic reactions. Often difficult to identify are also those food components which trigger a nonspecific mast cell activation. Due to their particular clinical relevance, wheat intolerances of different pathogenesis are also discussed. As a consequence of their complexity with regards to disease-causing proteins, target organ manifestations, pathomechanisms and diagnostic clarification, these require a particularly differentiated approach.
Purpose
This review article presents the current recommendations regarding the diagnosis of food intolerance and food allergy, with a separate focus on the specifics in the interpretation of different tests including IgE diagnostics.
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Abbreviations
- α‑Gal:
-
Galactose-α‑1,3‑galactose
- DD:
-
Differential diagnoses
- EGID:
-
Eosinophilic gastrointestinal disorder
- EoE:
-
Eosinophilic esophagitis
- FA:
-
Food allergy
- FPIES:
-
Food protein-induced enterocolitis syndrome
- HIT:
-
Histamine intolerance
- HWP:
-
Hydrolyzed wheat protein
- IBD:
-
inflammatory bowel disease
- IBS:
-
Irritable bowel syndrome
- IFN γ:
-
Interferon γ
- Ig:
-
Immunoglobulin
- nsLTP:
-
Nonspecific lipid transfer protein
- OAS:
-
Oral allergy syndrome
- WDEIA:
-
Wheat-dependent exercise-induced anaphylaxis
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U. P. Zieglmayer discloses that she was employed by Thermo Fisher Scientific until September 2019. There is no conflict of interest with the present work. S. Wieser states that she is employed by MacroArray Diagnostics. There is no conflict of interest with the present work. W. Hemmer and K. Hoffmann-Sommergruber declare that they have no competing interests.
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Zieglmayer, U.P., Hemmer, W., Wieser, S. et al. Food intolerances—a diagnostic challenge. Allergo J Int 31, 23–35 (2022). https://doi.org/10.1007/s40629-021-00194-2
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DOI: https://doi.org/10.1007/s40629-021-00194-2