Histamine intolerance is one of the more misunderstood reactions people have to food. It's not a true allergy, and it's often missed entirely because the trigger foods, wine, cheese, cured meats, leftovers, seem so different from each other. The common thread is histamine, a compound found naturally in many foods and produced by your own body.
What is histamine intolerance?
Everyone has an enzyme called DAO (diamine oxidase) that breaks down histamine from food. If your DAO levels are low, or you're eating more histamine than your body can process, histamine builds up and triggers symptoms similar to an allergic reaction, even though no true allergy is present.
Common symptoms of histamine intolerance
- Flushing or redness of the skin, especially the face
- Headaches or migraines, often after wine or aged cheese
- Hives or itching
- Nasal congestion or a runny nose unrelated to a cold
- Digestive symptoms like bloating or diarrhoea
- A racing heartbeat after eating certain foods
Because these symptoms overlap with allergies, intolerances and even anxiety, histamine intolerance is frequently missed or misdiagnosed.
Common high-histamine trigger foods
- Aged cheeses
- Cured and processed meats
- Red wine and other fermented alcoholic drinks
- Fermented foods, sauerkraut, kimchi, soy sauce, vinegar
- Leftovers and any food that's been sitting rather than freshly prepared (histamine increases as food ages)
- Certain fish, particularly if not very fresh
How is histamine intolerance identified?
There's no single definitive at-home test for histamine intolerance the way there is for a specific food allergy, since it's about a cumulative build-up rather than a single trigger. The most reliable approach combines:
Keeping a food and symptom diary to spot patterns around high-histamine foods
A low-histamine elimination period, followed by gradual reintroduction
Ruling out overlapping food intolerances with a broader intolerance test, since genuine intolerances to specific foods can compound histamine-related symptoms
Managing histamine intolerance
There's no cure, but most people manage it well by reducing high-histamine foods, prioritising fresh over aged or leftover food, and being cautious with alcohol, particularly red wine. Some people also find their symptoms improve once other food intolerances are identified and addressed, since digestive health and DAO function are closely linked.
If symptoms are severe, persistent, or you suspect a genuine allergy is involved, speak to a GP rather than relying on self-management alone.
