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Histamine intolerance is a presumed set of adverse reactions (such as flush, itching, rhinitis, etc.) to ingested histamine in food. The mainstream theory accepts that there may exist adverse reactions to ingested histamine, but does not recognize histamine intolerance as a separate medical condition that can be diagnosed. [1]
Histamine has two basic centres, namely the aliphatic amino group and whichever nitrogen atom of the imidazole ring does not already have a proton. Under physiological conditions, the aliphatic amino group (having a pK a around 9.4) will be protonated, whereas the second nitrogen of the imidazole ring (pK a ≈ 5.8) will not be protonated. [11]
Histamine is an organic compound that primarily functions in service of the human body's immune responses as well as for the regulation of many physiological functions. [1] Since their discovery in 1910, [ 2 ] histamines have been known to trigger inflammatory responses such as itching as part of an immune response to foreign pathogens; for ...
Histaminergic means "working on the histamine system", and histaminic means "related to histamine". [1] A histaminergic agent (or drug) is a chemical which functions to directly modulate the histamine system in the body or brain. Examples include histamine receptor agonists and histamine receptor antagonists (or antihistamines).
DAO levels in the blood circulation increase vastly in pregnant women suggesting a protective mechanism against adverse histamine. [12] Histamine is a potent vasodilator and can cause uterine contractions, which can lead to premature labor. DAO in the placenta breaks down histamine to prevent its accumulation and maintain a healthy pregnancy.
"For most healthy people, if you eat well and are physically active, eating fast food one time per week likely won't have much impact, particularly if you manage your portions and make better ...
Depending on the chemical nature of the antigens, blood types have different levels of hypersensitivity; for instance, A and B are more antigenic than other antigens. [10] Type II hypersensitivity. Damage can be accomplished via three different mechanisms: [10] Antibody binding to cell surface receptors and altering its activity
Food intolerances can be classified according to their mechanism. Intolerance can result from the absence of specific chemicals or enzymes needed to digest a food substance, as in hereditary fructose intolerance. It may be a result of an abnormality in the body's ability to absorb nutrients, as occurs in fructose malabsorption.