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If is for me. This is not the same as food allergy, this is a reaction to the histamine content of foods, or foods that cause mast cells to release histamine, coupled with genetic or acquired deficiency of the enzyme that breaks down histamine in the normal gut: http://ajcn.nutrition.org/content/85/5/1185.long I've noticed that almost everyone on a histamine intolerance forum is diagnosed with Hashimoto's or "adrenal fatigue" or high cortisol and also have a lot of gut symptoms: "Histamine intolerance results from a disequilibrium of accumulated histamine and the capacity for histamine degradation. Histamine is a biogenic amine that occurs to various degrees in many foods. In healthy persons, dietary histamine can be rapidly detoxified by amine oxidases, whereas persons with low amine oxidase activity are at risk of histamine toxicity. Diamine oxidase (DAO) is the main enzyme for the metabolism of ingested histamine. It has been proposed that DAO, when functioning as a secretory protein, may be responsible for scavenging extracellular histamine after mediator release. Conversely, histamine N-methyltransferase, the other important enzyme inactivating histamine, is a cytosolic protein that can convert histamine only in the intracellular space of cells. An impaired histamine degradation based on reduced DAO activity and the resulting histamine excess may cause numerous symptoms mimicking an allergic reaction. The ingestion of histamine-rich food or of alcohol or drugs that release histamine or block DAO may provoke diarrhea, headache, rhinoconjunctival symptoms, asthma, hypotension, arrhythmia, urticaria, pruritus, flushing, and other conditions in patients with histamine intolerance. Symptoms can be reduced by a histamine-free diet or be eliminated by antihistamines. However, because of the multifaceted nature of the symptoms, the existence of histamine intolerance has been underestimated, and further studies based on double-blind, placebo-controlled provocations are needed. In patients in whom the abovementioned symptoms are triggered by the corresponding substances and who have a negative diagnosis of allergy or internal disorders, histamine intolerance should be considered as an underlying pathomechanism. Full text at the link. A food list to be used as a guide to finding if you have histamine food triggers. I was gaining a lb a day on little food until I started eating low histamine and taking diamine oxidase. Dropped a lot of weight in two weeks: http://www.histaminintoleranz.ch/download/foodlist/21_FoodList_EN_alphabetic_withCateg.pdf This is the best list online, but some folks tolerate high hist foods, and react to low ones, it's only a guide to help figure out if you have any degree of histamine intolerance. http://www.ncbi.nlm.nih.gov/pubmed/1369594 Neuroendocrinology. 1992 Dec;56(6):851-5. Histamine H1 and H2 receptor activation stimulates ACTH and beta-endorphin secretion by increasing corticotropin-releasing hormone in the hypophyseal portal blood. Kjaer A1, Knigge U, Plotsky PM, Bach FW, Warberg J. Author information AbstractHistamine (HA) stimulates the release of adrenocorticotropic hormone (ACTH) and beta-endorphin (beta-END) via activation of central postsynaptic H1 or H2 receptors. The effect of HA is indirect and may involve the hypothalamic regulating factors corticotropin-releasing hormone (CRH), arginine vasopressin, or oxytocin (OT). We studied the effect of specific HA H1 or H2 receptor agonists on the concentration of CRH and OT in hypophyseal portal blood in urethane-anesthetized male rats. In addition we investigated the effect of the agonists on ACTH and beta-END immunoreactivity in peripheral plasma in conscious male rats pretreated with antiserum to CRH. Intracerebroventricular administration of the H1 receptor agonist 2-thiazolylethylamine (2-TEA) or the H2 receptor agonist 4-methylhistamine (4-MeHA) increased the CRH concentration in pituitary portal blood by 80-90% when compared to preinfusion levels (p < 0.05). Central infusion of saline had no effect. The level of OT in the pituitary portal blood was not affected by 2-TEA or 4-MeHA when compared to saline-treated rats. Intracerebroventricular infusion of 2-TEA or 4-MeHA increased the ACTH concentration in peripheral plasma 3- or 4-fold, respectively (p < 0.01). Pretreatment with a specific CRH antiserum (abCRH) inhibited the responses by 50 and 70%, respectively (p < 0.01). Intracerebroventricular administration of 2-TEA or 4-MeHA increased the beta-END immunoreactivity in peripheral plasma 3- or 2-fold, respectively (p < 0.01). These effects were inhibited by 80-90%, when rats were pretreated with abCRH (p < 0.01).(ABSTRACT TRUNCATED AT 250 WORDS) PMID: 1369594 [PubMed - indexed for MEDLINE]