Some of the biochemistry that typically characterizes autism:
1) Th2 skew to the immune system. http://www.ncbi.nlm.nih.gov/pubmed/9627004
2) Overproduction of monoamine neurotransmitters. http://www.ncbi.nlm.nih.gov/pubmed/7914177
3) Oxidative stress. http://www.ncbi.nlm.nih.gov/pubmed/15585776
4) Vascular damage. http://www.ncbi.nlm.nih.gov/pubmed/16908745
5) Excessive neuronal connectivity. http://www.cell.com/cell-reports/fulltext/S2211-1247%2813%2900570-6
6) Extreme male brain. http://cogsci.bme.hu/~ivady/bscs/read/bc.pdf
Some of the effects of excessive supplementation with vitamin D in the young:
1) Th2 skew to the immune system. http://www.ncbi.nlm.nih.gov/pubmed/15564440
2) Overproduction of monoamine neurotransmitters. http://www.ncbi.nlm.nih.gov/pubmed/19053013
3) Oxidative stress. http://www.ncbi.nlm.nih.gov/pubmed/16620292
4) Vascular damage. http://www.ncbi.nlm.nih.gov/pubmed/227138
5) Excessive neuronal connectivity. http://www.sciencedirect.com/science/article/pii/S0304394003003033
6) High testosterone production. http://www.ncbi.nlm.nih.gov/pubmed/211541
My name is Seth Bittker and my son has been affected by ASD. After thinking about his development and carefully weighing the evidence I have come to the conclusion that oral vitamin D was a factor in inducing autism in him and I believe the same is true of a number of others.
If you are interested in hearing more, please feel free to peruse my paper on this topic here: http://omicsgroup.org/journals/infant-exposure-to-excessive-vitamin-d-a-risk-factor-for-autism-2165-7890.1000125.pdf.
If you wish to correspond with me about this, I would welcome it. My email address appears in the paper I published on this topic.