The Way to a Man's Brain

Per the WSJ:

A growing body of research shows the gut affects bodily functions far beyond digestion. Studies have shown intriguing links from the gut's health to bone formation, learning and memory and even conditions including Parkinson's disease.

Scientists have unearthed connections from the gut to the brain that have not heretofore been obvious:

Low serotonin levels in the brain are known to affect mood and sleep. Several common antidepressants work by raising levels of serotonin in the brain. Yet about 95% of the serotonin in the body is made in the gut, not in the brain.

And..

In a study of 23 autistic children and nine typically developing kids, a bacterium unique to the intestines of those with autism called Sutterella was discovered.

To these unscientific eyes the relationship between autism and digestion is a far more promising line of study than the pseudo-science that attributed autism to vaccinations.