Gut microbiota and the gut–brain axis in autism spectrum disorder and attention-deficit/hyperactivity disorder: A scoping review of shared and disorder-specific mechanistic pathways
Background Autism spectrum disorder (ASD) and attention-deficit/hyperactivity disorder (ADHD) are among the most prevalent neurodevelopmental conditions worldwide, yet the biological mechanisms driving their onset and phenotypic variability remain incompletely understood. The gut–brain axis (GBA), a bidirectional netwo...