Histamine and histamine intolerance.
Level 5 - mechanism / opinion, no new human data
Narrative review of biochemical mechanisms and clinical concepts without primary trial data or systematic search methodology.
PubMed 17490952 · doi:10.1093/ajcn/85.5.1185
What was done
This narrative review synthesized literature on histamine intolerance, detailing the enzymatic degradation pathways of histamine (diamine oxidase [DAO] and histamine N-methyltransferase [HNMT]), dietary and pharmacological triggers, clinical manifestations, and potential management strategies.
What was found
The abstract reports no quantitative data or statistical comparisons. It describes that reduced DAO activity impairs the breakdown of ingested histamine, potentially causing diarrhea, headache, rhinoconjunctival symptoms, asthma, hypotension, arrhythmia, urticaria, pruritus, and flushing. These manifestations are reported to be provoked by histamine-rich foods, alcohol, or DAO-blocking drugs, and improved by histamine-free diets or antihistamines.
Why it matters
It provides a diagnostic and mechanistic framework for clinicians to consider histamine intolerance in patients presenting with unexplained, recurring multi-system allergy-like symptoms when classical allergies have been ruled out.
Limits
The abstract provides no primary human experimental data, numerical metrics, or systematic search criteria. As a narrative review, it relies on descriptive synthesis, and the authors explicitly note that rigorous double-blind, placebo-controlled provocation studies remain needed to establish evidence.
Cited by
- supports Diamine oxidase (DAO) is an enzyme that helps counteract and break down histamine accumulation in the body.