Table 5.

Phases of dietary measures in patients with suspected HIT. Adapted according to [1].

Phase	Objective	Recommendation	Duration
Phase 1: Elimination phase	Reduction in symptoms to a maximum possible level	• Change in diet composition - introduction of mixed diet measures with accent on fresh vegetables and reduction of biogenic amine intake, in particular histamine • Nutrient optimization	10–14 days
Phase 2: Test phase	Reintroducing foods excluded in Phase 1, after taking into account individual risk factors (stress, menstruation, medication use etc.)	• Targeted gradual reintroduction of suspected foods taking into consideration patient’s individual dietary preferences • Assessment of individual sensitivity to ingested histamine	Up to 6 weeks
Phase 3: Long-term diet	Maintenance of high-quality of life Continual balanced diet	• Individual nutritional recommendations based on individual sensitivity to ingested histamine taking exogenous risk factors into consideration	_