First of all, what is histamine?
Histamine is a neurotransmitter involved in the immune system and nervous system as well as a component of stomach acid crucial for proper digestion. Histamine also triggers the inflammatory response to attack infection and illness and dilates blood vessels and sends white blood cells to the site of inflammation.
Normally, histamine is present at safe levels in the body, but some people may have histamine intolerance or sensitivity. This occurs when there is a build-up of histamine and the body is unable to fully break it down, which can cause allergy symptoms.
What is the link between caffeine and histamine?
Coffee is actually high in histamine and can result in an allergic reaction but it is different to a typical allergy mechanism.
With caffeine, the histamine contained in the coffee causes an inflammatory reaction that can be affect some people with caffeine and histamine intolerances.
In more scientific terms, the caffeine results in the body releasing more glutamate in the posterior hypothalamus (PH) and this results in an increased in activity of wake-active histamine neurons.
Does decaffeinated coffee have less histamine?
Because decaffeinated coffee contains almost no caffeine, it should not have the effect that caffeinated coffee does on histamine levels in those who suffer from allergic symptoms.
For example, Swiss Water Decaf coffee is certified 99.9% caffeine-free.
As with all things, for those who suffer from histamine allergies, it is sensible to consult your medical practitioner and to trial decaffeinated coffee gradually as all people and their symptoms are different.