I have to disagree because "total refusal to eat healthy foods" is another one of the many subjective observations that muddies the definition of autism, which is as loose of a definition as you can get in my opinion.
Are they autistic because they don't eat right or do they not eat right because they are autistic?
The fact that the definition is so broad leads you to conclude they don't know why it is, or how to change it, or even cause it. Even the definitions of ASD, and or Aspergers has changed. Many who would not have qualified for the diagnosis 30 years ago would qualify now. Money is involved, at the schools, and the schools are the ones doing the testing. But, there is a real need for it. These kids are smart, but the environment is blocking them from learning or expressing.
What is needed is some kind of scientific, measurable, and conclusive understanding of the condition. Until then we are all just grasping in the dark, without even a brain scan.
I think we are the early days of Neuroscience.
Not me, oh and do sports, but ive hidden it very well.