In the context of allergies, I keep reading the term "histamine liberators" with claims that certain foods release histamine. A random example from everydayhealth.com:
Some foods, while low in histamines themselves, are known as histamine liberators, meaning that they help to release histamine from other foods.
Foods with histamine-releasing properties include citrus, peanuts, fish, shellfish, and egg whites.
I'm interested in understanding the mechanism behind histamine liberators, i.e., where is the histamine stored, which processes lead to the release, and does a "liberation" lead to lower histamine levels?
I have no expertise in medical science, and my attempt to search for scientific publications on that topic wasn't successful. This makes me wonder where the notion of histamine liberators is coming from. Is it nonsense or simply not yet researched well enough? If there is preliminary evidence: Where is the list of food coming from?