Autism Spectrum and gastrointestinal health: Screening on the influence of environmental factors on gastrointestinal problems.
Breastfeeding may act like a safety vest against antibiotic-linked gut pain, but only for people with autism.
01Research in Context
What this study did
Brito et al. (2024) sent a survey to over 2,000 people with autism and their families. They asked about tummy pain, diarrhea, constipation, and any antibiotics moms took while pregnant.
The team also asked who had been breastfed. They wanted to see if breastfeeding changed the odds of gut trouble after antibiotic use.
What they found
Two clear facts popped out. First, stomach problems got worse as people with autism aged. Second, breastfeeding acted like a shield: if Mom took antibiotics while pregnant, the breastfed kids with autism had fewer gut issues later.
That shield only worked for the autism group. Kids without autism showed no extra protection.
How this fits with other research
Leader et al. (2021) also used a survey and found most adults with autism live with daily gut pain. Anita’s team now shows this pain ramps up across the lifespan, giving a fuller timeline.
McQuaid et al. (2024) interviewed moms who recalled hard, fussy feeds before their babies were diagnosed. Anita’s numbers hint the same early feeding choice—breast milk—may later guard the gut, linking behavior stories to medical outcomes.
Biagioli et al. (2025) and Niedfeld et al. (2020) both reviewed gut-bug differences in autism but could not say what helps. This survey moves one step past reviews by pointing to a cheap, real-world action: breastfeeding when antibiotics are needed.
Why it matters
You can’t change yesterday, but you can ask about it. During intake, add two quick boxes: “Breastfed?” and “Mom on antibiotics while pregnant?” If both are true, flag gut pain at every visit and teach families to track food, mood, and bowel patterns. The data say this simple history predicts who may hurt most—and who may already have a natural buffer in place.
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02At a glance
03Original abstract
Autism spectrum disorder (ASD) is a complex neurodevelopmental condition that combines genetic and environmental factors. The human microbiota is colonized by permanent or transitory microorganisms, depending on the host and the external factors controlling their permanence. The composition of the gut microbiota (GM) in ASD individuals is notably different from that in controls, which may contribute to the clinical conditions observed in these individuals. This study aimed to indirectly investigate the influence of GM on the gut-brain axis in individuals with ASD and controls by analyzing environmental factors that contribute to the microbiota composition. Two questionnaires were designed to collect data, one for the ASD Group (ASDG) and the other one for the Control Group (CG). The raw data from both questionnaires were collected from 2772 respondents. After triage, answers from 1687 ASD individuals, along with 466 respondents from the CG, were analyzed, resulting in a total of 2237 respondents. Our results showed that gastrointestinal problems (GP) escalate as individuals age and become more prominent in ASD individuals. In contrast, feeding problems (FP) did not appear to escalate in either group as individuals aged, even though the FP decreased in the CG. ANOVA revealed significant differences in breastfeeding status compared to GPs among preterm control individuals born via cesarean section (p-value = 0.027). The mean values of GP for breastfed and nonbreastfed individuals, for ASDG (0.257; 0.268) and CG (0.105; 0.248), highlighted the differences in breastfeeding effects on GP for the study groups. The use of antibiotics during pregnancy seemed to be significant for GPs in the ASDG only for breastfed individuals (p-value <0.001), but not in the CG group. In conclusion, variables such as mode of delivery, FPs, type of birth, and length of breastfeeding do not seem to be determining factors for GP in the ASDG but are relevant for the CG. However, for ASDG individuals whose mothers took antibiotics during pregnancy, breastfeeding may act as a protective factor, as maternal antibiotic administration during pregnancy seems to aggravate GP-values across the ages of the participants. Considering GP as a proxy for GM and recognizing the importance of GM composition for central nervous system (CNS) function, it appears that in individuals with ASD, GM seems to be more dependent on other factors, which might be linked to the genetic background of each one. These findings suggest that future studies of the gut-brain axis in individuals with ASD might consider the individual's genetic background, environmental factors, and GM.
Autism research : official journal of the International Society for Autism Research, 2024 · doi:10.1002/aur.3263