A comprehensive review led by King’s College London finds limited clinical evidence for generic high-fiber diets in treating chronic constipation and recommends specific foods and supplements instead.
By yourNEWS Media Newsroom
A major new analysis from King’s College London has found that long-standing medical advice to treat constipation with a general high-fiber diet and increased water intake is not strongly supported by clinical evidence, prompting new guidelines that emphasize specific, targeted dietary interventions.
The research, published in October in Journal of Human Nutrition & Dietetics and Neurogastroenterology & Motility and endorsed by the British Dietetic Association, represents the first evidence-based dietary guidelines developed specifically for adults with chronic constipation. The work was led by Dr. Eirini Dimidi, a reader in nutritional sciences at King’s College London.
Researchers evaluated evidence from more than 75 clinical trials using the GRADE framework, a widely accepted system for assessing the quality of medical evidence. Their findings indicate that while fiber is important for overall health, there is little high-quality evidence that advising patients to follow a vague or generic “high-fiber diet” reliably improves constipation symptoms. The review identified only one randomized controlled trial comparing high- and low-fiber diets for constipation, which showed no significant benefit from higher fiber intake.
Instead, the guidelines strongly recommend three specific interventions shown to be effective in clinical trials: magnesium oxide supplements, psyllium fiber supplements and mineral water high in magnesium and bicarbonate. Magnesium oxide acts as an osmotic laxative by drawing water into the intestines, with the guidelines recommending a total daily dose of two grams divided across the day. Mineral water with high magnesium and bicarbonate content works through a similar mechanism and was associated with improved bowel movements when consumed regularly over several weeks.
Psyllium, a soluble fiber supplement, received a strong recommendation after consistently improving stool frequency and consistency in trials. The researchers emphasized a key distinction between psyllium and general dietary fiber, noting that evidence supports the supplement specifically, rather than broad advice to increase fiber intake from unspecified sources.
The guidelines also provide conditional recommendations for certain foods where evidence is promising but less robust. These include kiwi fruit, selected probiotic strains and rye bread. Kiwi fruit contains actinidin and magnesium, which may support digestion and gut motility, while rye bread can act as a prebiotic, promoting bacterial activity associated with bowel function.
Beyond identifying effective treatments, the study promotes a shift away from one-size-fits-all advice toward a more personalized approach. Recommendations are aligned with specific patient symptoms, such as stool frequency, consistency and straining, allowing clinicians to tailor dietary strategies more precisely. A clinical decision-support tool was developed alongside the guidelines to assist healthcare providers in applying this approach.
The authors also highlighted gaps in existing research, noting that the overall quality of evidence in dietary management of constipation remains limited. They outlined priority areas for future investigation to improve understanding of how specific foods and supplements affect gut health.
“Constipation is a gastrointestinal condition involving difficulty with bowel movements or having fewer than three per week,” said BrightU.AI’s Enoch. “It is often caused by insufficient fiber or fluid intake. Other contributing factors can include aging and underlying health problems.”
Researchers said the guidelines are intended as a practical resource to improve quality of life for patients with chronic constipation and to encourage more rigorous research in nutritional science, with the goal of refining dietary recommendations based on measurable clinical outcomes.
Watch and discover the reasons to include psyllium husk into your diet.
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Source: Natural News
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