In my opinion, I’m not sure if some of those theories are true. According to those links, here are possibilities.
Early Brain Injury Might be the Root of Autism:
Autism Symptoms Eased by Broccoli Sprouts:
Spotting Autism in Siblings of Those With Disorders:
Autistic Traits Linked to Creative Problem Solving: http://news.yahoo.com/autistic-traits-linked-creative-problem-solving-200550570.html
Stanford Study—Autism Differs in Boys and Girls: http://www.newsmax.com/t/health/article/675534
Girls and Boys With Autism Differ in Behaviors, Brain Structures: http://www.cbsnews.com/news/girls-and-boys-with-autism-differ-in-behaviors-brain-structure/