I guess it's only obvious when a loved one or someone close to you is affected by a medical condition or disease you want to find out how or why it has occurred. Autism still has no solid evidence as the cause but there are many theories and ongoing research.
I recall a few years back we were delving into Dr Amy Yasko's research and work into Autism. Dr Yasko's expertise was mainly in biochemistry, molecular biology, and biotechnology, this led her into forms of chronic neurological inflammation, including Autism. Her Autism treatments are based on bio-medical diet and supplementation, with a very strict regime on testing and and the appropriate protocols.
Here is some info and links on her fascinating insight into Autism