Hidden sources of High-histamine foods

Aged, fermented and cured foods rich in histamine; can drive flushing, loose stools and headaches.

Where it hides

Fermented condiments: miso, fish sauce, and soy sauce — fermentation is a direct histamine-generating process, even in small condiment amounts
Leftovers held in the fridge more than a day — histamine levels in meat, fish, and poultry tend to keep climbing the longer they sit after cooking, even when refrigerated properly
Slow-simmered bone broth or stock — histamine mainly forms when bacteria act on proteins during prolonged simmering plus the extended fridge storage and reheating that bone broth typically gets — not from cook time alone
Canned or jarred fish (tuna, anchovies, sardines, mackerel) — these are typically made from fish that's been aged or held before canning, a high-histamine process
Store-bought tomato sauce, ketchup, and citrus-heavy dressings — tomatoes and citrus are commonly described as histamine liberators — thought to trigger the body's own histamine release beyond what's in the food itself, though this mechanism is less rigorously studied than the other triggers in this app
Aged cheeses (Parmesan, blue cheese, sharp cheddar), chocolate/cocoa, and aged alcohol (wine, champagne, aged spirits) — aging and fermentation concentrate histamine directly in these foods; chocolate and alcohol are also commonly described as histamine liberators, thought to trigger the body's own histamine release, though the evidence behind that specific mechanism is more contested

Information only — not medical advice or a diagnosis. Settle structures a self-experiment and helps you track what you observe.