I used a supplement which was helpful so I found the doctor on you tube and listened to him answer questions regarding gut health and the microbiome. It's a bit scientific but the explanations are clear. Glyphosate (Agent Orange, Round Up) is an antibiotic which kills that which helps our gut provide serotonin and dopamine.
Autism had doubled between 2012 and 2015
It's a fascinating discussion about what is happening to our brain in regard to neuropsychoendocrinology.