Introduction: The Rise of the Gut-Autism Hypothesis
Autism spectrum disorder (ASD) diagnoses have increased over the past decade, leading scientists and families alike to search for potential biological explanations beyond genetics. One popular hypothesis centers on the gut microbiome—the trillions of microorganisms residing in our intestines—and its possible impact on autism through the so-called “gut-brain axis.” This concept suggests that intestinal bacteria can influence brain function and behavior, providing a promising avenue for understanding autism’s complexities and identifying novel treatments.
Interest in this idea was further boosted by observations that individuals with ASD frequently experience gastrointestinal (GI) problems compared to their neurotypical peers. Early studies proposed that a “leaky gut” or imbalanced microbiome might underlie both digestive symptoms and certain behavioral features of autism. As a result, the gut microbiome emerged as a hot topic in autism research, featured widely in the scientific literature and popular media.
