This seems a little bit speculative. Studies have already shown abnormal HPA axis activity in autism: http://onlinelibrary.wiley.com/doi/10.1111/j.1440-1819.19

This seems a little bit speculative. Studies have already shown abnormal HPA axis activity in autism: http://onlinelibrary.wiley.com/doi/10.1111/j.1440-1819.1984.tb00793.x/abstract http://onlinelibrary.wiley.com/doi/10.1111/j.1440-1819.1984.... (The HPA axis is one of the main modulators of bowel motility). So basically there is already research showing that the brain is influencing the gut in autism, but the idea that the gut might be influencing the brain in autism is speculative.