Histamine Intolerance: Understanding the Causes and Managing The Symptoms

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allergies due to histamine intolerance

Histamine intolerance is a condition that is gaining recognition in the field of functional medicine. It is characterized by an impaired ability to break down histamine, leading to an accumulation of this inflammatory molecule in the body. 

As functional medicine practitioners, it is essential to understand the underlying causes, symptoms, and management strategies for histamine intolerance to better assist our clients. 

What Is Histamine Intolerance 

Histamine intolerance refers to a condition where there is an impaired ability to break down histamine, leading to an accumulation of this biogenic amine in the body. Histamine is a chemical compound involved in various physiological processes, including the immune response, digestion, sleep and neurotransmission.

Normally, the body produces enzymes, such as diamine oxidase (DAO) and histamine N-methyltransferase (HNMT), which help metabolize and regulate histamine levels. However, in individuals with histamine intolerance, these enzymes are deficient or not functioning optimally, resulting in an excess of histamine.

Common Signs of Histamine Intolerance Symptoms

The symptoms of histamine intolerance can vary from person to person and may resemble other conditions, making it challenging to determine. Some common symptoms and signs include:

1. Digestive issues – Abdominal pain, bloating, diarrhea, constipation, acid reflux, and nausea.
2. Skin manifestations – Itching, hives (urticaria), redness, flushing, and swelling.
3. Respiratory symptoms – Runny nose, nasal congestion, sneezing, coughing, wheezing, and asthma-like symptoms.
4. Headaches – Migraines, tension headaches, and sinus headaches.
5. Fatigue – Generalized tiredness, low energy levels, and difficulty concentrating.
6. Cardiovascular symptoms – Rapid heart rate (tachycardia), low blood pressure (hypotension), and dizziness.
7. Mood and neurological symptoms – Anxiety, irritability, depression, brain fog, and difficulty sleeping.

histamine intolerance, alergies, genetics and more

Causes and Triggers of Histamine Intolerance

Genetic Predisposition and Enzyme Deficiency

Histamine intolerance can have a genetic component, and some individuals may be genetically predisposed to having lower levels or decreased activity of the enzymes responsible for breaking down histamine, such as DAO and HNMT. This genetic predisposition can increase the risk of histamine intolerance development.

Gut Dysbiosis and Histamine-producing Bacteria

An imbalance in the gut microbiome, known as gut dysbiosis, can contribute to histamine intolerance. Certain strains of bacteria in the gut have the ability to naturally produce histamine, as part of their normal metabolic processes. When there is an overgrowth of these bacteria or an imbalance in the gut microbial community, histamine production can increase, leading to symptoms of histamine intolerance.

Dietary Factors and High Histamine Foods

Consuming certain high histamine foods or foods that trigger the release of histamine can contribute to histamine allergic reactions. Histamine foods include aged and fermented foods like cheese, cured meats, sauerkraut, wine, and vinegar.

Additionally, certain foods are known to trigger the release of histamine in the body, such as citrus fruits, strawberries, tomatoes, shellfish, and chocolate. For individuals with histamine intolerance, eating a low histamine diet and avoiding these foods may be necessary, at least temporarily, to manage symptoms.

Histamine Liberators and Medications

Certain substances and medications can cause the release of histamine or block histamine receptors and the activity of DAO, exacerbating histamine intolerance. Histamine liberators include alcohol, certain food additives (e.g., monosodium glutamate – MSG), and some medications (e.g., nonsteroidal anti-inflammatory drugs – NSAIDs). Additionally, medications that block the effects of histamine, such as antihistamines, can interfere with histamine metabolism and lead to histamine accumulation.

Approaches to Recognizing Histamine Intolerance

History and Symptom Analysis

You can identify histamine intolerance by taking a detailed history and conducting a comprehensive symptom analysis. Inquiring about medical history, including allergy symptoms or medication use, can provide important clues. 

Histamine Intolerance Symptoms, such as digestive issues, skin manifestations, and respiratory tract symptoms, headaches, and fatigue, should be explored in detail. It is also important to consider the timing and duration of symptoms in relation to food intake and other potential triggers.

eczema because of histamine intolerance

Laboratory Tests and Biomarkers for Histamine Intolerance

While there is no specific test for histamine intolerance, certain laboratory tests and biomarkers can provide supportive evidence. These include:

  1. Serum diamine oxidase (DAO) levels – A deficiency in DAO, the enzyme responsible for breaking down histamine, can be indicative of histamine intolerance. Low levels of DAO in the blood may suggest impaired histamine metabolism.
  2. Histamine levels – Measuring histamine levels in the blood or urine can help assess histamine accumulation. Elevated histamine levels may indicate histamine intolerance, especially when combined with gastrointestinal disorders or with appropriate gastrointestinal symptoms alone.
  3. Genetic testing Genetic testing can identify variations in genes associated with histamine metabolism enzymes, such as DAO and HNMT. Though not definitive, these results can provide additional insight into potential susceptibility to histamine intolerance.

Different and Co-existing Conditions

Histamine intolerance shares symptoms with other conditions, making it important to consider the alternatives. Conditions such as seasonal allergies, food allergies, mast cell activation syndrome (MCAS), gastrointestinal disorders, autoimmune diseases, allergic reactions, and other inflammatory conditions can have overlapping symptoms.

Assessing these conditions and ruling them out is essential to ensure an accurate assessment of histamine intolerance. Additionally, it is important to recognize that histamine intolerance can coexist with other health conditions, and addressing these underlying conditions may also alleviate histamine intolerance symptoms.

Histmaine and histamine blockers

Strategies for managing Histamine Intolerance

Elimination and Low-histamine Diet Guidelines

One of the primary strategies for managing histamine free diet and intolerance is following a low-histamine to no-histamine diet. This involves avoiding or minimizing foods that are high in histamine or allergic reaction triggers. Some dietary guidelines for histamine intolerance include:

Avoiding histamine-rich foods – This includes aged and fermented foods, cured meats, aged cheeses, alcoholic beverages, and certain fruits and vegetables.

Limiting histamine-releasing foods – Citrus fruits, strawberries, tomatoes, shellfish, and chocolate can trigger the release of histamine in some individuals and may need to be restricted.

Opting for fresh foods – Freshly cooked meals with low-histamine vegetables and fruits, can be included in the diet.

Being mindful of food freshness and storage – Histamine levels can increase in foods that are improperly stored or left at room temperature for extended periods, so ensuring proper food storage and freshness is important.

Nutritional Supplements in Lowering Histamine Levels (Natural Antihistamines)

Certain nutritional supplements can support histamine metabolism and reduce symptoms of histamine intolerance. These include:

Vitamin C – A natural antihistamine that can help reduce histamine levels in the body.

Vitamin B6 – Supports the activity of DAO, helping with histamine breakdown.

Quercetin – A flavonoid with antihistamine and anti-inflammatory properties.

N-acetyl cysteine (NAC) – Supports glutathione production, which helps reduce histamine.

Omega-3 fatty acids – Have anti-inflammatory effects and can help balance the immune response.

Gut Healing and Microbiome Support

Since gut dysbiosis can contribute to histamine intolerance, addressing gut health is crucial. Strategies for gut healing and microbiome support may include:

Probiotics – Selecting strains of probiotics that do not produce histamine and can help restore balance in the gut microbiome.

Prebiotics – Consuming prebiotic-rich foods or supplements to support the growth of beneficial gut bacteria.

Gut-healing nutrients – Including nutrients like glutamine, zinc, and omega-3 fatty acids, which support gut integrity and healing.

Addressing gut infections – Underlying gut infections, like h-pylori, or imbalances in microbiome may contribute to histamine intolerance.

Lifestyle Modifications and Stress Management:

Stress can exacerbate histamine intolerance symptoms, so implementing stress management techniques is important. This may include:

Mind-body practices – Encouraging relaxation techniques such as meditation, deep breathing exercises, yoga, or tai chi.

Sleep hygiene – Prioritizing quality sleep to support overall health and immune function.

Stress reduction – Identifying and addressing stressors in life and finding healthy coping mechanisms.

Physical activity – Engaging in regular physical activity, which can help reduce stress and support overall well-being.

Histamine intolerance presents a unique set of challenges for clients and practitioners alike. By understanding the underlying mechanisms, triggers, and treatment strategies, functional medicine practitioners can effectively support clients in managing their symptoms and improving their overall well-being. 

For Further Information

Visit ReInventHealthcare.com to check out other topics related to histamine intolerance and the immune system. 

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If you want to reinvent healthcare and make a difference to improve our broken healthcare system, visit www.INEMethod.com.

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