Let's all go outside and roll around in dirt

"Although correlations have been noted between the composition of the gut microbiome and behavioural conditions, especially autism¹, neuroscientists are only now starting to understand how gut bacteria may influence the brain. The immune system almost certainly plays a part, Mazmanian says, as does the vagus nerve, which connects the brain to the digestive tract."

Gut-brain link grabs neuroscientists