What is histamine?

Histamine is the most commonly-known vasoactive amine. It is found, at low levels, in a variety of foods.

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Which foods contain histamine?

Histamine is found in a wide range of foods, including:

• Cured meats

• Certain cheeses 

• Eggs

• Specific types of fish and seafood

• Certain vegetables such as tomatoes, spinach and avocado 

• Certain fruits such as bananas, oranges and strawberries

• Fermented soya including miso and tofu 

• Drinks such as coffee and champagne 

 

What causes these symptoms? 

Most people can eat histamine containing foods with no problem. For a minority of people, these compounds cause symptoms on eating. 

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The cause of these symptoms is complex. Current research suggests that they may be related to low levels of the enzyme

di-amine oxidase (DAO), that breaks down histamine. Other factors include genetics, stress, gut damage and certain medications. 

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Symptoms can occur within 30 minutes of eating, but some people have a more delayed reaction, hours after eating.

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Symptoms of Histamine Intolerance:

• Flushing, itching, swelling, urticaria (hives/nettle rash)

• Runny or blocked nose, asthma

• Irregular heartbeat, hypotension (drop in blood pressure) 

• Abdominal pain, nausea, diarrhoea, bloating

• Headache

• Increased anxiety

• More painful periods, in those who menstruate 

 

How is it diagnosed?

Our specialist dietitians are able to diagnose histamine intolerance through a process of clinical assessment alongside a controlled exclusion diet. 

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Why see a dietitian?

It is important to see a dietitian to ensure your symptoms are related to diet and that your intake remains nutritionally optimum while excluding foods.

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In addition to dietary changes, our team are able to advise on other lifestyle factors that can help manage the condition.