ReviewJournal of clinical medicine2026
The Gut-Brain Axis in Fetal Alcohol Spectrum Disorder (FASD): Why the Gut Shapes Behavior, Depression, and Self-Injurious Behavior in Children with Prenatal Alcohol Exposure-A Narrative Review with a Proposal for Staged Nutritional and Microbiological Intervention.
Review in Journal of clinical medicine, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Prenatal alcohol exposure (PAE) leads to fetal alcohol spectrum disorder (FASD), the most common preventable cause of neurodevelopmental impairment. The classical narrative attributes the clinical picture of FASD exclusively to direct ethanol-induced brain injury. In the present review, we argue that this perspective is incomplete and leads to diagnostic errors, most often to the misdiagnosis of ADHD in children who in fact have FASD. We propose that, alongside the direct neurotoxicity of ethanol, an important and clinically under-recognized complementary mechanism is gut-brain axis dysfunction: alcohol damages the enteric nervous system and enteric glial cells, induces dysbiosis with deep deficits of butyrate and other short-chain fatty acids (SCFAs), damages the enterochromaffin cells responsible for 90% of peripheral serotonin production, and-through translocation of lipopolysaccharide (LPS) and activation of the Toll-like receptor 4 (TLR4)-sustains a neuroinflammatory brain signature. This cascade-superimposed on direct ethanol neurotoxicity-may account for the high rates of depression, anxiety, self-injurious behavior, and suicide attempts observed in individuals with FASD and for the limited efficacy of traditional interventions focused solely on the central nervous system. The 2024 Polish Institute of Mother and Child (Okulicz-Kozaryn et al.) study showed that 50.3% of pregnant women consumed alcohol, and 11% did so regularly, against only 7% who admitted so in questionnaires. The real clinical picture of children with FASD is further complicated by three factors to which we devote separate sections in this paper: prenatal co-exposure to nicotine, cannabinoids, and opioids; the loss of vertical microbiota transmission and breastfeeding in children transferred to foster care (where the prevalence of FASD is 18.8% and in children's homes in some regions reaches up to 80%); and the substantial over-representation of preterm and small-for-gestational-age (SGA) infants (in the Hasken et al. cohort, 18.4% of children with FASD were born preterm and 51.4% were born SGA). In the final section, we present a structured, staged protocol for nutritional and microbiological intervention grounded in a hierarchy of evidence: from interventions supported by randomized controlled trials (RCT-level; choline) through interventions supported by strong mechanistic rationale and RCTs in related populations (sodium butyrate,
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