In my 28 years as a naturopath, I’ve seen the “histamine conversation” evolve from a niche concern to a headline act. If you’re navigating the choppy waters of perimenopause or menopause, you’ve likely encountered the “histamine wall.” Suddenly, that evening glass of Shiraz or your healthy morning spinach smoothie leaves you with a racing heart, itchy skin, a migraine, or a sudden bout of “brain fog.”
The internet will tell you it’s a DAO (diamine oxidase) deficiency. They’ll say, “Just take an antihistamine and stop eating avocados.” But focusing on the complex, multi-layered network involved in histamine clearance can inspire hope and reassurance that more effective support is possible.
Let’s look at why your body might be struggling to “clear the deck” and how we can support the system from the ground up.
Checkpoint 1: The DAO “Bouncer” (The Gut Gatekeeper)
DAO is the enzyme primarily found in the lining of your small intestine. Think of DAO as the bouncer at the door of a nightclub. Its job is to check the ID of every histamine molecule coming in from your food and kick them to the curb before they enter your bloodstream.
If you don’t know which foods are “bringing the party,” here are some of the foods on the High-Histamine Hit List:
- Fermented foods: Sauerkraut, kimchi, kefir, kombucha, and soy sauce.
- Alcohol: Especially red wine, champagne, and beer.
- Aged dairy: Mature cheeses like Parmesan, cheddar, and Gouda.
- Processed meats: Salami, pepperoni, bacon, and cured ham.
- Certain produce: Spinach, eggplant, tomatoes, and avocados.
- Leftovers: Histamine levels increase in protein-rich foods the longer they sit in the fridge.
Why does this checkpoint fail in perimenopause?
- Aging & Inflammation: DAO activity naturally declines as we age because our intestinal lining doesn’t regenerate as quickly.
- Hormonal Shifts: Fluctuating estrogen can increase mast cell activation, while intestinal inflammation (common during hormone shifts) can degrade the cells that produce DAO.
- Nutrient Gaps: DAO is a picky worker; it requires Copper and Vitamin B6 to function. If your levels are low, the bouncer essentially falls asleep on the job.
- Alcohol & Medications: Alcohol is a double threat; it is high in histamine and directly inhibits the DAO enzyme from doing its job. It’s a double whammy for your system. It increases intestinal inflammation, and certain medications can further inhibit DAO activity.
So, if the bouncer fails, histamine floods into your circulation. But what happens once it’s already inside?
Checkpoint 2: The Transport Highway (The Cellular Shuttle)
Once histamine enters your blood, it doesn’t just disappear. It needs to get inside your cells to be neutralised. This is handled by transporters called OCT3 (Organic Cation Transporter) and PMAT (Plasma Membrane Monoamine Transporter).
The catch: These shuttles are shared lanes. They also carry dopamine, serotonin, and adrenaline. If you are stressed (high adrenaline), taking medications like Metformin, steroids, or beta-blockers, or experiencing systemic inflammation, the “histamine lane” on the highway gets jammed. When histamine can’t get through this checkpoint, it stays in circulation, causing those classic “allergic” symptoms.
Understanding these factors empowers you to make holistic lifestyle choices, like stress management, that support your transport system.
Checkpoint 3: The HNMT Cleanup Crew (Intracellular Breakdown)
Once histamine finally makes it inside the cell, especially in the brain, where DAO doesn’t exist, a new enzyme takes over: HNMT (Histamine N-methyltransferase).
This checkpoint relies entirely on methylation. To clear histamine here, your body needs a steady supply of SAMe, which depends on:
- Folate (B9) and B12
- Choline
- Riboflavin (B2)
- Magnesium (to support essential metabolic reactions)
The Final Step: After HNMT completes its job, the remaining byproduct is broken down by MAO-B. If you have genetic variants in MAO-B or are low in B2, the “trash” piles up inside the cell, potentially affecting your mood and sleep.
Perimenopause- The Big Picture
Histamine isn’t the enemy; it’s a vital signalling molecule. The real challenge is understanding how to support its clearance, so you feel cared for and understood.
At Naturopathy Me, we look at:
- Gut Integrity: Supporting your DAO bouncer and inflamed gut.
- Methylation Support: Analysing DAN SNPs and fuelling the HNMT cleanup crew with the right B vitamins.
- Hormonal Balance: Addressing the estrogen spikes that trigger mast cells to dump more histamine into an already full bucket.
Relying solely on antihistamines masks symptoms. Addressing root causes across all the body’s systems empowers you to take control of your health journey. By finding out why you are struggling to clear it, we may be able to help you enjoy that avocado again.
Ready to clear the deck?
Stop guessing and start addressing the root cause of your symptoms.
In celebration of ATMS Natural Medicine Week, I am offering 10% off all initial naturopathic consultations when you use the code ATMS26. Whether you’re looking to dive into hormone testing, gut health, or DNA analysis, now is the perfect time to start. Book your consultation or a free discovery call today, and let’s build a clear, natural roadmap to help you feel like yourself again.
Offer valid for new patients and initial consultations only. Cannot be used in conjunction with any other offer. Valid until 31.05.26.
Disclaimer: This article is for informational purposes only and should not replace professional medical advice. Always consult a qualified healthcare practitioner before changing your health regimen.
References
- Maintz, L., & Novak, N. (2007). Histamine and histamine intolerance. The American Journal of Clinical Nutrition.
- Comas-Basté, O., et al. (2020). Histamine Intolerance: The Current State of the Art. Biomolecules.
- Schwelberger, H. G. (2010). Histamine N-methyltransferase: a key enzyme in histamine metabolism. Encyclopedia of Life Sciences.
- Wu, X., et al. (2015). Role of Organic Cation Transporter 3 (OCT3) and Plasma Membrane Monoamine Transporter (PMAT) in Histamine Clearance. Journal of Biological Chemistry.











