“… 68 Thus, opting to incorporate a tailor-made diet plan in the overall treatment of neurologic conditions, including autism and schizophrenia, is increasingly common practice. 10 , 41 , 68 , 71 , 72 , 84–86 However, for microbiota to play a clinical role in nutritional interventions for maintaining (brain) health, 68 , 87 a reliable diagnostic determination of the gut microbial composition is wanting 88–91 —hence, the focus of this forward-looking review article.…”