Ever have coughing fits after eating? Irritation in the upper esophagus? Does that coughing trigger tachycardia, dizziness, or headaches? What about sudden acid reflux or a runny or stuffy nose after eating?
You could be experiencing histamine intolerance. It can be scary and feel like a mystery illness.
I was having these issues and I did a 30 day low histamine diet. It totally changed what I could eat and how I felt!
What is histamine?
Histamine is a chemical your immune system and gut use to communicate. Think of your body’s mast cells as the storage units—they release histamine to protect you when they sense a threat, like an allergen or stress. Normally, an enzyme in your gut called DAO (Diamine Oxidase) acts like a bouncer, breaking down the histamine you ingest from food so it doesn’t build up.
But if your mast cells are overactive, or your gut doesn’t produce enough of that DAO enzyme, your “histamine bucket” overflows. That overflow acting like a toxin in your bloodstream is what causes the coughing, racing heart, and reflux.
Below are the major histamine foods most people consume and how the diet works.
High-Histamine Foods (Foods that naturally contain high levels of histamine):
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Fermented and Aged Foods: Aged cheeses, sauerkraut, kombucha, yogurt, and soy sauce.
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Leftovers: Histamine grows rapidly on cooked food the longer it sits in the fridge.
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Aged or Cured Meats: Bacon, salami, or any meats that aren’t cooked immediately after thawing.
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Certain Vegetables: Tomatoes, eggplant, and spinach.
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Alcohol: Especially red wine and beer.
Histamine Liberators (Foods that trigger your body to release its own stored histamine, or block your DAO enzyme):
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Avocados
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Nuts (especially walnuts and cashews)
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Chocolate and cocoa
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Citrus fruits
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Coffee and spicy foods
How to do a Low Histamine Diet?
The goal is to empty your “histamine bucket” by strictly eliminating both high-histamine foods and histamine liberators for 30 days. Because histamine grows rapidly on food as it sits, you must cook meat immediately after thawing, and freeze any meals right after cooking rather than eating days-old leftovers from the fridge.
After 30 days, test your baseline by gradually reintroducing foods one at a time to see what your body can tolerate.
Can’t I just take antihistamines?
Yes. Xyzal was something I took to help turn the corner on this. Especially if I was feeling discomfort in my esophagus it seemed to help. Quercetin is a supplement I took which helps with mast cell inflammation.
If your level of histamines is low, and/or your body’s ability to handle the load is strong, then antihistamines might be enough. If you’re experiencing symptoms frequently [for me it was daily], then you may need to go with the histamine abstinence diet in order to course-correct.
How will I know if the low histamine diet worked?
Gradually try introducing histamine-rich foods and see if you get symptoms
If you do, you probably have to do the elimination diet for another couple of weeks to 30 days more.
If you’re testing foods and you’re feeling okay and not having a reaction, then continue to test and gradually add things and pay attention to your body.
If you relapse, which I have done, then you can try dialing back the histamine-rich foods in your diet, especially the ones you eat in large quantity, and taking quercetin and or Xyzal or another anti-histamine.
If symptoms come back intensively, then you probably have to do the full abstinence diet again until you reach baseline.
Conclusion
My symptoms were so bad I thought I would never be able to eat things like nuts and tomatoes again. in the beginning I didn’t even know what was wrong with me until I went to a GI doctor and they suggested the low histamine diet .
The great news is that I really only needed to do that diet for 30 days and take the quercetin and I am now eating everything– nuts, tomatoes, peppers ,chocolate, cheese. So healing is possible!
(One quick note: If your primary symptom is a runny or stuffy nose immediately after eating, and dialing back histamines doesn’t fix it, you might be reacting to a different trigger. I wrote a separate breakdown on how polysaccharides and gums cause those exact respiratory issues right here: Food Causing Post-Nasal Drip and Sticky Phlegm (Starches &Gums).)
Resources:
Managing your gut health is part of feeling and. I’ve also created an interactive nervous system regulation guide, tools that support a calm and grounded life.
Medical disclaimer
Medical Disclaimer: I am not a doctor; I am just a nerd about optimizing my health. This article is for informational purposes only and is not medical advice. Always consult your doctor before making changes to your diet, supplements, or medications.