Distinct diet-microbiome associations in autism spectrum disorder.

This study looked at how diet affects gut bacteria in 818 children with and without autism. Children with autism had stronger reactions between their diet and gut bacteria. Poor diet was linked to more autism symptoms and stomach problems. Certain artificial food additives (polysorbate-80 and carrageenan) disrupted gut bacteria in autistic children but not in other children, suggesting children with autism may be more sensitive to what they eat.

This large-scale study examined the relationship between diet, gut microbiome, and autism symptoms in 818 children (462 with ASD, 356 without). Researchers found that children with autism showed stronger connections between their diet and gut bacteria compared to neurotypical children. Poor diet quality was linked to more severe autism symptoms, gastrointestinal problems, and unusual eating behaviors. Notably, synthetic food additives like polysorbate-80 and carrageenan disrupted gut bacterial networks specifically in children with ASD, while having minimal impact on neurotypical children.

These findings suggest children with autism may be more sensitive to dietary factors and highlight the potential importance of avoiding certain food additives in this population.

Findings suggest children with ASD may benefit from avoiding synthetic food additives, particularly polysorbate-80 and carrageenan. Results support development of personalized nutritional strategies for autism and highlight the need for revised dietary guidelines considering the heightened diet-microbiome sensitivity in this population.

Study design not specified in abstract. Cross-sectional nature (if applicable) would limit causal inferences. Mechanisms underlying increased dietary sensitivity in ASD remain unclear. Generalizability to broader autism population uncertain without demographic details.

Autism spectrum disorder (ASD) is linked to both altered gut microbiota and unhealthy diets; however, the mechanistic connections remain elusive. In this study, we conducted a systematic analysis of fecal microbiome metagenomic data, paired with granular dietary assessments and phenotypic profiles, across a cohort of 818 children (462 with ASD, 356 without ASD; mean age = 8.4 years; 27.3% female). By integrating dietary indices, nutrient intake, and food additive exposures, we uncovered ASD-specific linkages to the microbiome. Poor dietary quality correlated with aggregated core autistic symptoms, gastrointestinal complications, and atypical eating behaviors.

Notably, children with ASD exhibited a more pronounced diet-microbiome interaction network compared to neurotypical peers, suggesting heightened microbial sensitivity to nutritional inputs. Furthermore, synthetic emulsifiers-specifically polysorbate-80 and carrageenan-were associated with disrupted microbial connectivity in ASD, a phenomenon attenuated in neurotypical children. Our findings elucidate the mechanistic links between dietary factors-particularly synthetic food additives-and microbiome dysregulation in ASD, urging a re-evaluation of dietary guidelines for ASD populations and laying the groundwork for personalized nutritional strategies.