The news is in: autism is not genetic
The debate on whether autism is caused by genes or the environment has raged ever since I became involved in this field more than ten years ago. Medicine has always favored the genetic theory and hundreds of millions of dollars have been poured into identifying the gene or genes that cause it
, with few if any conclusive results to date.
Some – like me – were skeptics all along and argued that you can’t have an epidemic of a genetic disease. Parents have been divided, some hoping that finding a genetic cause could lead to a cure, while others who had seen their children deteriorate after a battery of vaccines or some other event argued that the cause was man-made or environmental.
In reality, the genetic theory of autism was poorly supported from the outset. There were just two very small studies on twins from Europe backing it, but both studies involved too few children to reach conclusive evidence.
In fact, if a study is based on a sample that is too small, almost anything can happen and it generally does not correlate with the population at large. An example of this is tossing a coin only three times. It would not be so unusual for heads to come up every time but we would be hard-pressed to conclude that heads will always come up regardless of how many times a coin is tossed.