Histamine – Products, Intolerance and Allergy, Tests. Low-Histamine Diet

Histamine constitutes a pivotal biologically active amine that fulfills indispensable roles across a multitude of physiological processes within the human body, encompassing the modulation of cardiovascular system functionality, gastrointestinal tract operations, respiratory system mechanics, as well as exerting influence upon central nervous system activity and dermal structures. Furthermore, it serves as a primary mediator within inflammatory response pathways—particularly those of allergic etiology—as substantiated by empirical research [2]. The endogenous biosynthesis of histamine occurs through the enzymatic decarboxylation of the amino acid histidine, a reaction catalyzed by L-histidine decarboxylase. Notably, in addition to internal production, histamine may also be exogenously introduced into the organism via dietary intake, a phenomenon corroborated by specialized scientific literature [3].

The highest concentrations of histamine are predominantly found in foodstuffs subjected to prolonged maturation processes or microbial fermentation. This category encompasses, among others: cheeses of varying textures (particularly aged hard and semi-hard varieties, processed cheeses, and those containing mold cultures), fermented dairy products (including plain and flavored yogurts, sour cream, acidophilus milk), pickled vegetables and fruits, whole-grain cereals, certain fruit varieties (such as strawberries, avocados, bananas) and vegetables (including tomatoes, legumes, and sauerkraut). Equally significant are: baker’s and brewer’s yeasts, fish (especially long-term frozen or smoked varieties), shellfish (shrimp, mussels, squid), and alcoholic beverages—with a predominant presence of red wine, unpasteurized beer, and champagne.

It is crucial to emphasize that improperly stored food items (e.g., at elevated temperatures or beyond their expiration dates) can also serve as substantial histamine sources, as they facilitate the proliferation of histamine-producing bacteria. Furthermore, a distinct group of food products—not only containing histamine themselves—exhibits the capacity to trigger excessive release of endogenous histamine from mast cells within the body. Substances with such properties include: pungent spices (e.g., chili peppers, cayenne pepper), herbs (basil, oregano), dried fruits (apricots, raisins), and a broad spectrum of food additives—among them monosodium glutamate (flavor enhancer E621), synthetic colorants (e.g., tartrazine E102), preservatives (sodium benzoate E211), and antioxidants (e.g., BHA E320, BHT E321) [3].

Histamine hypersensitivity syndrome arises from a disproportion between the ingestion of histamine and the organism’s capacity to metabolize it efficiently. This condition presents with a broad spectrum of symptoms that are frequently misinterpreted by both affected individuals and healthcare professionals. The clinical manifestations stem from elevated histamine levels, which may result from excessive dietary intake of this biogenic amine; however, the primary etiologic factor is an inherited or acquired deficiency in enzymatic activity—specifically, diamine oxidase (DAO) and histamine N-methyltransferase (HNMT)—the enzymes responsible for histamine catabolism within the gastrointestinal tract. The symptomatic profile of the disorder is highly variable in both nature and severity, with extreme cases potentially leading to life-threatening complications. Depending on blood histamine concentration, symptoms can be categorized as follows: levels of 1–2 ng/ml induce hypersecretion of gastric juices, tachycardia, and cutaneous flushing; concentrations of 3–5 ng/ml trigger migrainous headaches, urticaria, pruritus, and accelerated heart rate; levels of 7–12 ng/ml provoke bronchospasm; and concentrations approaching 100 ng/ml may culminate in cardiac arrest. Cardiovascular symptoms include palpitations, arrhythmias, hypotension, anaphylactic shock, syncope, and—in severe instances—sudden cardiac death. Respiratory manifestations predominantly feature dyspnea, paroxysmal coughing, and expiratory wheezing. Gastrointestinal symptoms encompass abdominal pain, hypersecretion of hydrochloric acid, diarrhea, and intestinal dysmotility, with emerging evidence suggesting a potential association between histamine intolerance and autoimmune inflammatory bowel diseases. Otolaryngological symptoms manifest as sneezing, rhinorrhea, facial erythema, and pruritus, closely mimicking allergic reactions. Neurologically, the condition may provoke headaches, migraines, nausea, vomiting, circadian rhythm disturbances, thermoregulatory dysfunction, and feeding difficulties. Dermatological presentations include pruritus, erythema, urticaria, angioedema, inflammatory skin lesions, and exacerbation of conditions such as acne vulgaris, rosacea, or psoriasis. Recent scientific findings confirm that adherence to a low-histamine diet in patients with atopic dermatitis secondary to histamine intolerance leads to significant clinical improvement [2].

Food allergy is a form of the body's adverse reaction to food in which clinical conditions are released and then formed by improper immune mechanisms. Food hypersensitivity that is not associated with immune system involvement is called a non-allergic reaction [4]. Histamine is a substance to which secretion occurs during an allergic reaction. In addition to the above mentioned, it is also found in some foods and beverages. If allergy symptoms occur after them, it means that there is histamine intolerance.

The diagnostic process for allergic disorders incorporates a range of specialized testing protocols. Among the foundational methods routinely employed when immunological hypersensitivity is suspected are skin prick tests, which are performed on the epidermal surface. The underlying mechanism of allergic reactions involves the interaction between an allergen and specific immunoglobulin E (IgE) antibodies, which under normal physiological conditions are bound to receptors on the membrane of mast cells. Upon exposure to the antigen, these cells undergo degranulation, leading to the release of numerous inflammatory mediators—including histamine, a pivotal factor responsible for the development of clinical symptoms [6]. However, detecting histamine in the context of food allergies presents significant diagnostic challenges, as the body’s response is not directly attributable to the ingested product but rather stems from elevated concentrations of this biogenic amine generated through food metabolism. It is critical to note that while allergic symptoms typically manifest shortly after exposure, food intolerance symptoms may emerge with a delayed onset, substantially complicating the patient’s ability to independently identify the causative agent.

The management of histamine intolerance relies on the rigorous adherence to a specialized dietary protocol designed to minimize the intake of foods rich in histamine or those that trigger its release. Individuals affected by this condition must eliminate alcoholic beverages, fermented products, and naturally histamine-containing items such as spinach, tomatoes, or aged dairy products from their diet. Additionally, it is critical to avoid foods that provoke substantial histamine secretion from mast cells, including citrus fruits, strawberries, and chocolate. A cornerstone of the nutritional approach involves ensuring adequate intake of vitamin C (ascorbic acid) and vitamin B6 (pyridoxine), both of which play pivotal roles in histamine metabolism by enhancing the activity of the enzyme diamine oxidase (DAO). Foods characterized by minimal histamine content include freshly prepared, unprocessed meats (particularly poultry), fish processed immediately post-catch (not frozen), most root and leafy vegetables (excluding avocados, eggplants, and tomatoes), whole grains (brown rice, quinoa, buckwheat), plant-based protein sources (lentils, chickpeas), and plant-derived fats (coconut oil, extra virgin olive oil). It is essential to recognize that histamine fulfills indispensable physiological functions, participating in immune response regulation, digestive processes, and neurotransmission. However, excessive levels may lead to symptoms such as migraines, cutaneous eruptions, gastrointestinal disturbances, or edema. Consequently, individuals diagnosed with histamine intolerance should diligently monitor their dietary composition and develop a personalized nutrition plan in collaboration with a dietitian specializing in food allergies and sensitivities.