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Histamine intolerance (HIT) stems from insufficient diamine oxidase (DAO) enzyme activity in the gut, leading to histamine buildup and various symptoms. Dietary changes and DAO supplements can effectively manage HIT-related gastrointestinal issues.

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Area of Science:

  • Gastroenterology
  • Clinical Nutrition
  • Biochemistry

Background:

  • Histamine intolerance (HIT) is linked to reduced gastrointestinal diamine oxidase (DAO) activity, impairing histamine breakdown.
  • HIT presents with diverse, non-specific gastrointestinal and extra-intestinal symptoms, often overlooked in differential diagnoses.
  • Medications and gastrointestinal mucosal conditions can decrease DAO activity, exacerbating HIT.

Purpose of the Study:

  • To highlight the significance of histamine intolerance in unexplained gastrointestinal disorders.
  • To emphasize HIT as a primary gastrointestinal condition originating in the gut.
  • To advocate for including HIT in the differential diagnosis of functional gastrointestinal complaints.

Main Methods:

  • Review of current evidence on histamine intolerance and DAO enzyme function.
  • Analysis of diagnostic challenges and the role of anamnesis with standardized questionnaires.
  • Discussion of therapeutic strategies including histamine-reduced diets and oral DAO supplementation.

Main Results:

  • Clinical diagnosis of HIT is challenging; standardized anamnesis is crucial.
  • Low serum DAO values may support HIT diagnosis, though gut DAO activity correlation is unproven.
  • Histamine-reduced diets and oral DAO capsules are effective in symptom management.

Conclusions:

  • Histamine intolerance should be considered in patients with functional gastrointestinal complaints and diseases of unknown origin.
  • Increasing evidence suggests HIT is fundamentally a gastrointestinal disorder originating in the gut.
  • Targeted dietary interventions and DAO supplementation can alleviate HIT symptoms.