Many urban legends are framed as complete stories with plot and characters. The compelling appeal of a typical urban legend is its elements of mystery, horror, fear or humor.Often they serve as cautionary tales.ecause people frequently allege that such tales happened to a  friend of a friend  (FOAF), the phrase has become a commonly used term when recounting this type of story. Sometimes urban legends are repeated in news stories, or distributed by e-mail or social media.
We have mast cells in the stomach wall. Somastatain-which is produced from d cells in the stomach wall is a known mast cell activator. We also know stress-in particular substance p and CRH also cause mast cells to spill contents. Histamine which we know is a chemical constantly released.
Release of acetylcholine, norepinephrine and serotonin are all controlled in part by histamine levels. Injection of histamine into the hypothalamus increased metabolism of norepinephrine and serotonin, while dopamine metabolism increased in some places and not in others.hen this happens, it stimulates vomiting. Some foods contain serotonin, but it does not cross the blood brain barrier and thus does not affect brain chemistry. Mast cells contain dopamine, a hormone and neurotransmitter. This chemical is most often associated with reward seeking behavior, including addiction behaviors.