I'm a special ed teacher. I learnt that autism is a severe form of ADD.
There is a continuum:

ADD---------------------------------------------------------------> Autism

My son was on the very severe end.

He was born completely normal but deteriorated on SAD diet, vaccinations,
and antibiotics.

I was a school teacher and took him to the doctor for shots, then he got
atopic and had bronchitis and  had constant ear infections. I took him to
the dr and he got tons of antibiotics, round after round.  I never
questioned the doctor! I remember asking once if the vaccines were safe and
he said, oh yes.

Bingo by age 3 I had a completely autistic child. I thought he was deaf, he
had NO awareness of the world around him. It's hard to even think about it.
I was told he would end up in an institution and there was no hope. He lost
his speech and his  motor skills. The County put him in the vegetable class
for kids that lie around in the fetal position. (!)

We had continual diarrhea and constipation, plus seizures.

I got the internet finally and did some research.

Somehow I found the paleo diet, cannot remember how!

Then I also met a woman on this list who wrote me about low carb.

The two together (paleo, low carb) produced huge results.

He is not cured, is in managed recovery. He does horseback riding, dancing,
skiing,  ice hockey, tennis, and won the spelling bee for the third year in
a row this year. All from a child who had almost completely lost his speech
and skills.

Hope that helps.

Mary
ps I nearly gave up so many times. It has taken incredible patience. The
skills came back over years not months. Ray Audette helped me as I was very
discouraged . It seemed like adults can recover so fast on paleo diet. He
told me to be patient and keep plugging away and not a month goes by that
you do not see another little piece of progress. It's tons of hard work and
I find most people can't do this, too much work. I have to be fanatical
about wheat and dairy. It changes your whole life. The rewards are worth it
as I have a loving and normal child back who enjoys life.

Another website that helped a ton was the greatplainslaboratory.com website.