Study links gut-brain disorders and eating conditions, highlighting bidirectional risks and depression's role

A comprehensive UK cohort study reveals a close relationship between gastrointestinal disorders and eating conditions, with depression and disorder sequence playing key roles in the complex interplay, suggesting a need for integrated treatment approaches.

A large UK cohort study suggests that disorders of gut-brain interaction and eating disorders are closely linked, and that the relationship may run in both directions. Writing in Clinical and Translational Gastroenterology, researchers led by Stella-Maris C. Egboh at the University of Newcastle analysed records from more than 1.25 million people and found that people with these gastrointestinal conditions were more likely to develop eating disorders, while depression appeared to raise the risk further.

The findings add to a growing body of evidence that digestive symptoms and disordered eating often overlap. Earlier studies, including work indexed on PubMed and in Eating and Weight Disorders and The International Journal of Eating Disorders, have already shown that many patients with eating disorders report at least one disorder of gut-brain interaction. Reviews have likewise argued that the two conditions should not be considered in isolation, given the frequent presence of bloating, constipation, abdominal pain and other symptoms that can complicate diagnosis and treatment.

In the new study, the strongest links were seen between chronic constipation and anorexia nervosa, as well as with eating disorders more broadly. But the sequence of diagnosis was not what the investigators expected: in most cases, the eating disorder came first. Depression stood out as an independent predictor of a gut disorder appearing before an eating disorder, reinforcing the idea that psychiatric symptoms may sit at the centre of this clinical picture rather than merely follow it.

That interpretation is not universally accepted. Angela Favaro, a psychiatry professor at the University of Padua, told Univadis Italy that the registry-based design supports association, but not proof of predisposition or causation. She argued that eating disorders themselves can produce gastrointestinal complaints through restriction, vomiting, laxative misuse or dehydration, while some patients may develop disordered eating after being advised to restrict foods for functional bowel symptoms. Her comments reflect the broader clinical view, set out in earlier reviews, that management works best when gastroenterology, psychiatry, psychology and nutrition are brought together, with primary care helping to spot cases early and reduce the stigma that often delays treatment.