Relationship: Constipation (adults) and Fiber (unspecified)

Evidence supporting the use of: Fiber (unspecified)
For the health condition: Constipation (adults)

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Source of validity: Scientific
Rating (out of 5): 5

Dietary fiber is scientifically validated as an effective treatment for constipation in adults. Numerous randomized controlled trials (RCTs) and meta-analyses have demonstrated that increasing fiber intake, from either dietary sources or fiber supplements (such as psyllium, methylcellulose, or wheat bran), results in increased stool frequency, improved stool consistency, and reduced symptoms of constipation. The mechanism is primarily due to fiber’s ability to increase stool bulk and water content, which stimulates peristalsis and facilitates bowel movements.

Guidelines from major health organizations, such as the American Gastroenterological Association and the National Institute for Health and Care Excellence (NICE), recommend fiber supplementation as a first-line therapy for functional constipation in adults. Soluble fibers (e.g., psyllium) are generally better tolerated and more effective than some insoluble fibers. Typical recommended doses range from 20-35 grams per day from diet and/or supplements.

Fiber’s efficacy is supported by a 2016 systematic review and meta-analysis published in The American Journal of Clinical Nutrition, which found that fiber supplementation increased stool frequency and reduced the need for laxatives. Common side effects include bloating and flatulence, but these often diminish with gradual dose escalation. Overall, the use of fiber for adult constipation is strongly supported by high-quality scientific evidence.

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Evidence supporting the use of: Fiber (unspecified)
For the health condition: Constipation (adults)

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Other ingredients used for Constipation (adults)

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Evidence supporting the use of: Fiber (unspecified)For the health condition: Constipation (adults)

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Synopsis

Other ingredients used for Constipation (adults)

Other health conditions supported by Fiber (unspecified)

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Evidence supporting the use of: Fiber (unspecified)
For the health condition: Constipation (adults)