This, Not Diet, May Cause GI Trouble In Kids With Autism

Diet is not a contributing factor to the significant gastrointestinal issues common among children with autism spectrum disorder, research finds.

“Unfortunately, it’s not uncommon for those with autism to experience constipation, irritable bowel syndrome, abdominal pain, and other gastrointestinal issues,” says Brad Ferguson, postdoctoral research fellow in the radiology department at the University of Missouri School of Medicine and Thompson Center for Autism and Neurodevelopmental Disorders.

“We sought to find out whether nutritional intake in their individual diets was associated with gastrointestinal issues. Based on our findings, dietary intake does not appear to be the culprit for these issues, and other factors are likely at play.”

The research team’s past work identified a relationship between increased cortisol response to stress and gastrointestinal symptoms in people with autism spectrum disorder.

Cortisol is a hormone the body releases in times of stress, and one of its functions is to prevent the release of substances in the body that cause inflammation. In this study, the researchers sought to confirm or rule out dietary intake as a source of gastrointestinal problems.

The team studied 75 individuals between the ages of 5 and 18 who are part of the Autism Speaks Autism Treatment Network who were treated at the university’s Thompson Center for Autism and Neurodevelopmental Disorders. The individuals’ caregivers completed a questionnaire to assess the children’s gastrointestinal symptoms, as well as a questionnaire on food intake over the past month. The individuals also underwent two stress tests to measure cortisol levels.


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“We looked at the reported instances of gastrointestinal issues and compared them with 32 different nutrients found in a standard diet,” Ferguson says. “Contrary to what you may initially think, dietary composition does not appear to be a driving factor between stress response and gastrointestinal function in this sample.

“More research is needed to better understand the causes of these issues, but an increased reaction to stress does appear to be a contributing factor.”

About the Authors

The study was presented at the 2017 International Meeting for Autism Research (see the poster). The Autism Speaks Autism Treatment Network/Autism Intervention Research Network on Physical Health, the Health Resources and Services Administration of the US Department of Health and Human Services, and a University of Missouri School of Medicine Summer Research Fellowship supported the work.

The researchers have no conflicts of interest to declare related to this study. The content is solely the responsibility of the authors and does not necessarily represent the official views of the funding agencies.

Additional members of the research team are from the University of Missouri Thompson Center for Autism and Neurodevelopmental Disorders; Danielle Severns with the MU School of Medicine; Vanderbilt University; Boston University; and Columbia University.

Source: University of Missouri

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