Synopsis

Source of validity: Scientific
Rating (out of 5): 4

Synopsis: Dietary fiber is scientifically validated as a supportive treatment for both anal fissures and, to a lesser extent, anal fistulas. Clinical guidelines and multiple randomized controlled trials recommend the use of fiber supplements or high-fiber diets for patients with anal fissures. The primary mechanism involves softening the stool and increasing stool bulk, which reduces straining and trauma during defecation—key factors in the formation and persistence of fissures. For example, a systematic review published in the Diseases of the Colon & Rectum (2005) concluded that fiber supplementation significantly improved healing rates and reduced recurrence in patients with chronic anal fissure compared with placebo.

For anal fistulas, the evidence is less robust but still present. While fiber does not directly heal fistulas (which are abnormal tracts often requiring surgical intervention), it is recommended to prevent constipation and minimize trauma to the area during bowel movements, which can reduce discomfort and promote better hygiene postoperatively. International guidelines, such as those from the American Society of Colon and Rectal Surgeons, include fiber supplementation as part of conservative management strategies for both conditions.

In summary, the use of fiber for anal fissure is strongly supported by scientific evidence, while for anal fistula, its role is more as an adjunct to maintain bowel regularity and patient comfort.

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