Posted on 04-04-2012
Many folks these days have children who suffer either autism or autism-spectrum disorders. Many have questioned a genetic component, environmental component, or possibly a combination of both. Why then is autism rates in our country increasing quickly! This study review from the Archives of General Psychiatry in November 2011 looks at this very issue.
Autism is considered the most heritable of neurodevelopmental disorders. Therefore these authors wanted to provide rigorous quantitative estimates of genetic heritability of autism v. the effects of the environment. These authors assessed 192 twin pairs pertaining to Autism Spectrum Disorder (ASD).
The authors concluded that the susceptibility to ASD has moderate genetic heritability (37%) and a substantial shared twin environmental component (55%).
KEY POINTS FROM THESE AUTHORS:
1) "This study is the largest population-based twin study of autism that used contemporary standards for the diagnosis of autism."
2) "Autism is a complex neurodevelopmental disorder that interferes with the normal course of social, communicative, and cognitive development."
3) Over the last 30 years there has been a substantial (10-fold) increase in the prevalence of autism.
4) The prevalence for autism spectrum disorders (ASDs) is about 1% [1 in 100 children].
5) This study found a genetic heritability of 37% and an environmental component of 55% for ASD.
6) "The results suggest that environmental factors common to twins explain about 55% of the liability to autism."
7) "Although genetic factors also play an important role, they are of substantially lower magnitude than estimates from prior twin studies of autism."
8) This study provides evidence that environmental factors in autism "have been seriously underestimated in previous studies and the influence of genetic factors on the susceptibility to develop autism, overestimated."
9) Because of the reported high heritability of autism, a major focus of research in autism has been on finding the underlying genetic causes, with less emphasis on potential environmental triggers or causes.
10) These authors hypothesize that at least the environmental factors impacting susceptibility to autism exert their effect during the critical period between prenatal and early postnatal (first year) of life.
COMMENTS WE SHOULD TAKE AWAY FROM THIS
The book Legally Poisoned (2011) by Carl Cranor, PhD, from the University of California, Riverside, indicates that the blood-brain barrier is not fully developed in utero and in the first year of life. Consequently, exposures to environmental toxins during this time period cross the blood-brain barrier and adversely affect the developing brain. Dr. Cranor is especially negative on exposures to pesticides which he claims are designed to function as neurotoxins.
Neil Z Miller's 2011 study [Article Review 26-12] (Infant mortality rates regressed against number of vaccine doses routinely given: Is there a biochemical or synergistic toxicity?; Human & Experimental Toxicology) suggests:
All vaccines have a toxic component.
The toxic component of vaccines are synergistically toxic when multiple vaccines are administered.
The countries with the greatest number of mandated vaccines in the first year of life have the highest infant mortality rates, especially as related to Sudden Infant Death Syndrome, as a consequence of this early life synergistic toxicity.
There is mounting evidence that autism risk increases with exposures to toxins from many sources, beginning in utero through the first year of life.
There is mounting evidence that autism risk increases with exposures to toxins from many sources beginning in utero through the first year of life.
Guys, do your research, follow this blog, and be informed versus the dogma of what you are told to just accept "cause I say so."
Have a blessed day!
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