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 23 studies covering more than 1.9 million people and found people with ADHD had nearly 50% higher odds of gastrointestinal symptoms overall compared to those without ADHD.
- Specific digestive conditions showed even stronger associations: nearly twice the odds of constipation, a 58% increase in irritable bowel syndrome, and more than four times the odds of encopresis (loss of bowel control).
- The systematic review, published in the Journal of Attention Disorders, is the first devoted specifically to gastrointestinal symptoms in ADHD, drawing on studies from the USA, Sweden, Germany, and South Korea with participants aged 2 to 65.
- Researchers proposed several possible mechanisms, including ADHD-related impulsivity and irregular eating patterns, gastrointestinal side effects from ADHD medications, and gut microbiome differences that may influence communication between the gut and brain via the vagus nerve.
- Co-lead author Sarah Blake, a medical student at Warwick Medical School, said "almost every gut symptom we looked at: constipation, IBS, even indigestion, appeared to be associated with ADHD" and warned these symptoms "could easily be overlooked if the focus is on ADHD itself."
- The findings identify an association rather than proving causation; Dr. Saran Shantikumar said clinicians caring for ADHD patients should consider asking about gastrointestinal symptoms, particularly if they may be affecting quality of life.
Why it matters: ADHD affects roughly 5% of children and 3-4% of adults worldwide, meaning hundreds of millions of people may be carrying treatable digestive problems that standard ADHD care misses. The review is the first systematic look at this overlap, lagging comparable gut-autism research that has been well documented for years — so the practical shift is clinical: gastroenterologists and dietitians now have a stronger mandate to be looped into ADHD care, and ADHD clinicians have a reason to screen for GI issues that may be eroding patients' quality of life.
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