Beer

Beer is problematic on multiple fronts — the alcohol itself slows down the enzyme (DAO) your body uses to break down histamine, while the fermentation process adds histamine directly.

• DAO blocking — alcohol temporarily reduces DAO activity, meaning histamine from any source lingers longer in your system than it otherwise would

• Fermentation and other sensitivities — the brewing process builds up histamine naturally, and some people report additional sensitivity to gluten from barley or wheat as a separate co-occurring concern rather than a histamine mechanism as such

Lager-style beers are often reported as slightly better tolerated than ales or wheat beers, though individual responses vary.