I am not sure if this is an area that has been discussed in the past in relation to autism and it is quite complicated.. I have been researching the connection between histamine intolerance and Fibromyalgia, but also Aspergers which my son has. It has been confirmed by a select number of practioners that their is a genetic link with mental illness. A problem with our genetic dna results in a deficiency in methylation. Methylation is the process of deriving nutrients etc that go on to form neurotransmitters in the brain. Genetically a deficiency in the methylation process can cause you to be undermethylated or overmethylated which is detected by the amount of histamines in your blood. People with autism are usually undermethylated and require a specific amount of nutrients to correct the problem, calcium, magnesium, b6, vitamin c, zinc and methionine. It would be best to consult an orthomoleclar doctor/specialist in this area although I am about to try to integrate firstly low doses of these nutrients with magnesium which I have been taking long term and really cannot function without. Here is some reading.. it is complex.. I have beenresearchingthis area for about 5 years now and if you are wondering why this is not common knowledge the doctor involved in this organisation says that traditional medicine is about 50 years behind in this area. Also you have to be very careful integration nutrients in the form of supplements because those of us who are undermethylated cannot tolerate folic acid, methylfolate or vegetables that are high in folate ie. spinach etc. The first step would be to have a histamine test then you will know if your histamine is high, over 70 you're are undermethylated, normal range is between 40 to 70 and the relationship between histamine, high and being undermethylated does seem odd but reading further is necessary to resolve the problem particularly about vitaminc. When your levels of vitamin c are low your histamine will be high.
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Such an interesting topic, let me know if you are curious about this area in relation to autism... I can try to help you understand if possible.