The microbiome may be new, but treating children with behavioral issues with dietary intervention goes back 100 years (with varying levels of success). The GFC

The microbiome may be new, but treating children with behavioral issues with dietary intervention goes back 100 years (with varying levels of success). The GFCF diet (and others) seems to get criticized because parental reporting doesn't seem to match scientific studies. But the anecdotal evidence is overwhelming. The Autism Research Institute has surveyed thousands of parents about diet and results, and some of the diets have a high success rate with helping some symptoms.