A legitimate research area, stretched into claims the evidence doesn't yet support.
GAPS (Gut and Psychology Syndrome) proposes that gut permeability ("leaky gut") allows toxins to affect the brain, contributing to a range of psychological and developmental conditions — addressed through a restrictive, phased elimination diet built around bone broth and fermented foods.
Gut permeability and the gut-brain connection are genuine, active areas of legitimate research — our own gut health page covers this. Where GAPS overreaches is in its specific, confident claims linking gut health causally to conditions like autism and ADHD — claims that go well beyond what current evidence actually supports, and that have drawn concern from pediatric and nutrition professionals.
GAPS is a restrictive protocol, and its use in children specifically — given the developmental stakes and thin evidence for its central claims — is something we'd strongly encourage discussing with a pediatrician before adopting, not something to self-implement based on wellness blog content.
The gut-brain connection is real and worth taking seriously. The specific claims GAPS makes about causing or curing developmental conditions go well beyond that legitimate research.