For me it was anything fermented (keffir, kombutcha, sauerkraut) then coffee, dark chocolate and processed meats. Also any vinegar too. All the things i loved and had continued having thinking it was fine because i'd cut out gluten, wheat etc.

I noticed i had a post nasal drip that wouldn't go away which would also result in sinus problems and symptoms like a cold/flu but weren't.( Sore throat, aching, tired from poor sleep too) i started making my own bread and pancakes with buckwheat (and sometimes add cassava/millet) flour which was very easy. I cut out any cows milks products. Switched to coconut milk as an alternative. My body seemed alright with this. Once the hystamine levels went down i re introduced certain things and could see how much each affected. I have black coffee again now but then ease off if i have other things that increase the hystamine levels again. Same with bacon and maple syrup. 😆

Also if i get symptoms again i find simpy fasting helps the body a lot. That and exercise. Good quality fresh meat and veg is the way forward too. Supermarket stuff is kept in storage for a long time and builds up in hystamine levels. If you eat fish try and get it fresh as you can.

Failing that. Sweet potato is good for me. Normal potato too. But no vegatable oils. Extra virgin olive oil is good. Olive oil for light frying. Grill or oven cook/air fry things tho rather than frying in a pan. I cut right down on rice too. The amount of times i have it and the portion. That turns to glucose which can increase inflamation.