Low-histamine diet: foods, approach & evidence

Histamine in food: why freshness and storage matter

Histamine is ingested with food and broken down in the gut mainly by the enzyme diamine oxidase (DAO). Maintz and Novak (2007) described histamine intolerance as an imbalance between ingested histamine and degradation capacity — the model almost all dietary recommendations still build on. We explain the DAO and HNMT pathway in a separate article.

High-histamine foods are mainly those that were matured, fermented or stored for a long time: aged cheese, cured sausage, canned fish, sauerkraut, red wine or soy sauce. What matters is less the food than its condition — fresh fish contains little histamine, the same fish after storage considerably more.

Histamine breakdown: the role of DAO and HNMT →

Elimination, reintroduction and an individual diet

The German-language guideline (Reese et al., 2017, DGAKI, GPA, AeDA, SGAI) recommends a three-step approach: a short elimination phase on a low-histamine diet for about two weeks, then a test phase in which foods are reintroduced deliberately, and finally a long-term, individually adapted diet. The explicit aim is not a lifelong strict diet but the individual tolerance threshold.

Why low-histamine food lists disagree

Sánchez-Pérez et al. (2021) exposed a problem with common lists: comparing numerous published low-histamine diets with measured histamine contents, a large share of excluded foods were removed without solid data on their histamine content, and the lists contradicted one another. The rationale is often a presumed histamine-releasing effect that is not established for many foods.

What low-histamine diet studies show

Efficacy data so far come mainly from small studies. Wagner et al. (2017) examined a low-histamine diet in chronic spontaneous urticaria and reported improved symptom scores in part of the patients. In a pilot study, Sánchez-Pérez et al. (2022) observed changes in histamine-producing gut bacteria in women with histamine intolerance on a low-histamine diet.

A randomised, placebo-controlled trial of a low-histamine diet combined with DAO supplementation was published as a protocol by Duelo et al. (2024) — the protocol cited here reports no results. This underlines how young controlled research in this area is.

How pilot studies differ from controlled trials →

Histamine intolerance and MCAS: evidence cannot simply be transferred

People with mast cell activation are often advised the same diet. The rationale is plausible — less ingested histamine — but the sources cited here do not establish its efficacy in MCAS. Here too, dietary changes should be professionally supervised so the diet does not become unnecessarily restrictive.

MCAS supplements: research, not product promises →