[dchristian]

They have done studies that showed that it "helped" about 60% of the time (sorry I don't have the reference). "Helped" is a far weaker term than cured. I've read some of McCarthy's books and this is often the first thing to be tried. Often there is a long path to finding a workable cure for a specific person.

I went GFCF for other reasons (IBS and excess mucus production) and was surprised when my Asperger's started to go away. My personal theory is that the small, but frequent, morphine effects interfere with learning. When you take that away, low level learning can begin again.

I was "face blind" (i.e. didn't automatically recognize familiar faces) and didn't pick up on social cues. Both problems when away after 6-12mo on GFCF. A lot of social awkwardness comes from not picking up on these fundamental inputs.