Study of 1.9 million people finds a striking link between ADHD and gut problems — SkimNews
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- University of Warwick researchers analyzed data from more than 1.9 million people across 23 studies and found people with ADHD were almost 50% more likely to experience gastrointestinal symptoms than those without.
- Specific conditions showed even stronger associations: nearly double the odds of constipation, 58% higher odds of IBS, and more than four times the odds of encopresis (loss of bowel control).
- The study, published in the Journal of Attention Disorders, is the first systematic review devoted specifically to gastrointestinal symptoms in ADHD, drawing on research from the USA, Sweden, Germany, and South Korea with participants aged 2 to 65.
- Co-lead author Sarah Blake of Warwick Medical School warned that gut symptoms 'could easily be overlooked if the focus is on ADHD itself,' calling for clinicians to ask patients about digestive problems during appointments.
- Possible mechanisms researchers flagged include ADHD-related impulsivity and irregular eating patterns, gastrointestinal side effects from ADHD medications, and gut microbiome differences that may affect the gut-brain axis via the vagus nerve.
- Dr. Saran Shantikumar, Associate Clinical Professor at Warwick, stressed the findings identify association, not causation, and that further research is needed to disentangle biological factors from medication effects.
Why it matters: ADHD affects roughly 5% of children and 3-4% of adults globally, yet no prior systematic review had quantified how often gastrointestinal symptoms co-occur — meaning clinicians treating ADHD may routinely miss treatable digestive issues that meaningfully affect quality of life, particularly encopresis, which showed a fourfold increased odds.
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