Allergy? Infection? Or Dysbiotic Gut? Feels Like All Of Them, But Is It Actually Histamine Intolerance…?

Histamine intolerance is one part of a bigger story. The histamine response is only one element in our immune arsenal.

Mast cells are another key element of our overall immune response. I briefly mention mast cells in this article, but I strongly recommend you read Mast Cell Activation Syndrome if you feel your histamine intolerance is part of a bigger issue… and that your entire immune system is on red alert.

Histamine intolerance arises from an imbalance between histamine accumulation and the body’s ability to break it down. This is primarily due to the impaired activity of an enzyme known as diamine oxidase, or DAO.

Our DAO enzymes are responsible for metabolising histamine.

Symptoms of histamine intolerance include:

• Headaches or migraines
• Nasal congestion
• Digestive distress
• Skin reactions
• Fatigue
• Shortness of breath
• Swollen lips, tongue, or throat
• Diarrhoea
• Bloating
• Nausea or vomiting
• Flushing (redness in the face)
• Itching, rash, or hives
• Irregular or fast heart rate
• Low blood pressure
• Irregular or painful periods

Symptoms often mimic allergies but stem from systemic dysfunction rather than an immune response.

Histamine Intolerance: Natural Solutions To Address The Root Cause

Conventional medicine typically addresses symptoms of histamine intolerance with antihistamines or DAO supplements, but these fail to resolve the underlying causes.

Conversely, an holistic approach, that provides nutrient support whilst also targeting gut health and dietary triggers, is what offers a sustainable solution.

Gut Health: The Foundation Of Histamine Regulation

A compromised gut lining, known as leaky gut, is a primary driver of histamine intolerance. A leaky gut, also known as intestinal permeability, allows undigested food particles and bacterial byproducts (e.g., histamine-producing microbes) to enter systemic circulation. This triggers inflammatory and allergic responses.

Zonulin, a protein that modulates intestinal tight junctions, is up-regulated by gliadin, a component of gluten. It is also up-regulated by environmental toxins, and gut dysbiosis, thereby exacerbating histamine overload.

Key points regarding the up-regulation of zonulin:

Environmental Stimuli: Environmental toxins, heavy metals, moulds plus their byproducts: mycotoxins, and synthetic chemicals can trigger excessive zonulin release.

Bacteria and Infections: Gut infections, bacterial overgrowth, and toxins like lipopolysaccharides (LPS) from microorganisms are primary catalysts for zonulin release.

Dietary Triggers: Gluten (specifically gliadin fragments) is a significant trigger, causing zonulin release by binding to the CXCR3 receptor, particularly in individuals with celiac disease or gluten sensitivity.

Mechanism of Action: Increased zonulin leads to the disassembly of tight junctional complexes, increasing intestinal permeability, allowing toxins and antigens to enter the bloodstream.

Pathology: The constant up-regulation of zonulin can lead to chronic inflammatory disorders, autoimmune diseases, and neuroinflammatory diseases that cause dementia.

Restoring Gut Integrity

Some foods are naturally high in histamines. Other foods don’t contain a lot of histamine but can trigger your white blood cells to make it. Both kinds of foods can lead to too much histamine in your body if you have histamine intolerance.

The histamine foods to avoid are generally the ones that take longer to make than low histamine foods, such as fermented, aged, or overly processed foods. Low histamine foods are often the fresh foods that go straight from field to fork.

Eliminating dietary triggers:

• Gluten
• Processed foods
• High-histamine foods: fermented products + aged cheeses + alcohol + chocolate + leftover food + cured meats + alcohol, especially red wine + canned and semi-preserved fish

*Genuine sourdough bread contains a fraction of the gliadin of conventional breads – often 95% less – but beware of ‘sourfaux’ bread, as some companies are faking it. Also, only buy organic sourdough bread because of glyphosate contamination.

**Glyphosate, found in products like Roundup, is a class 2A carcinogen, and is catastrophic for digestive health. Studies indicate that glyphosate exposure can cause intestinal inflammation, damage the gut mucosal barrier, and affect intestinal permeability (leaky gut.) It also causes enzymatic dysfunction, preventing proper nutrient absorption and allowing undigested proteins to enter the colon, where they release damaging ammonia.

***Although many fruits are not high in histamine, they can trigger the release of histamines.

Some fruits can contain histamine-like substances that will aggravate symptoms. Limiting certain fruits and juices is an important part of a low-histamine diet. Consider avoiding:

• Banana
• Strawberries
• Papaya
• Cherries
• Citrus fruits
• Pineapple

More Foods High in Histamine: WebMD

Rebalancing Gut Flora

A healthy gut is populated by a diverse range of friendly bacteria that help us digest our food and defends against pathogenic bacteria, (bad bacteria). Collectively, the microbes in our gut are known as the microbiome.

Pathogenic bacteria, e.g. H. pylori, that causes stomach ulcers, and small intestinal bacterial overgrowth, (SIBO), can elevate histamine.

*Herbal antimicrobials like deglycyrrhizinated licorice (DGL) and chamomile soothe mucosal damage while inhibiting harmful microbes.

Nutrient support: Glutamine, found abundantly in cabbage juice, repairs the gut lining, while zinc and quercetin stabilise mast cells, reducing histamine release.

Learn more: Gut Microbiome

Natural Antihistamines & DAO Support

Several botanicals and nutrients counteract histamine excess without pharmaceutical side effects:

Organic Food Grade Black Seed Oil / Food Grade Organic Nigella Sativa Oil: Clinically proven to reduce allergic rhinitis symptoms by modulating immune responses and suppressing histamine release. A 2014 study found topical application resolved nasal congestion and itching in 92% of participants.

Stinging nettle (Urtica dioica): Inhibits histamine production and inflammation, offering relief for seasonal allergies and chronic histamine intolerance.

Quercetin: A flavonoid in apples and onions that stabilises mast cells and lowers histamine. Combines synergistically with vitamin C, which degrades histamine enzymatically.

DAO cofactors: Vitamin B6, copper, and vitamin C are essential for DAO enzyme function. Pineapple (containing bromelain) also enhances histamine breakdown.

The article Mast Cell Activation Syndrome provides more natural supplements to consider, and highly recommends a good number of antihistamine essential oils.

All of the best antihistamine essential oils can be found in a deeply calming Wild As The Wind Essential Oil Blend:

Deep Calm Essential Oil Blend

Dietary & Lifestyle Adjustments

Low-histamine diet: Prioritise fresh, unprocessed foods. Avoid leftovers (histamine increases with food ageing) and histamine-liberators like citrus, shellfish, and artificial additives.

Detoxification support: Liver health is critical for histamine clearance. Cruciferous vegetables (e.g., cabbage) and milk thistle enhance phase II detox pathways.

Stress management: Cortisol dysregulation exacerbates histamine intolerance. Adaptogens, such as ashwagandha, and natural treatments for stress, such as acupuncture, have been shown to rebalance HPA axis dysfunction, thereby reducing stress-induced histamine flares.

*The hypothalamic-pituitary-adrenal (HPA) axis is the body’s primary neuroendocrine system for responding to stress, linking the central nervous system and endocrine system. It is responsible for a cascade of events within the body, which ultimately result in the production of the stress hormone cortisol. (The hypothalamus releases CRH, stimulating the pituitary gland to secrete ACTH, which acts on the adrenal cortex to release cortisol.)

This mechanism regulates metabolism, immune function, and stress response via negative feedback.

HPA axis dysfunction leads to chronic systemic health issues due to the inability to properly manage stress hormones like cortisol.

This imbalance disrupts sleep + energy levels + mood, leading to conditions like:

• Chronic fatigue
• Anxiety
• Depression
• Cognitive impairment

It is closely linked to metabolic syndromes, immune system dysregulation, and cardiovascular disease.

Addressing Root Causes

Environmental and Genetic Factors Methylation support: Genetic polymorphisms (e.g., MTHFR mutations) impair histamine metabolism. Active folate (methylfolate), B12, and riboflavin optimise methylation pathways.

EMF and toxin avoidance: Electromagnetic pollution and heavy metals, like, mercury and aluminium, disrupt enzymatic processes, including DAO activity. Grounding practices and infrared sauna therapy aid detoxification.

Histamine intolerance is not an isolated condition. It is a symptom of systemic imbalances rooted in gut dysfunction, nutrient deficiencies, and environmental toxicity. By adopting a protocol emphasising gut repair, natural antihistamines, and detoxification individuals can achieve lasting relief without reliance on pharmaceuticals.