Synopsis

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

Dietary fiber is scientifically validated as a supportive measure in the management of diverticulitis, particularly in preventing recurrence after an acute episode. Historically, low-fiber diets were thought to contribute to the development of diverticular disease, and early observational studies suggested populations with high-fiber diets had lower incidence of diverticulosis. More recent evidence, including randomized controlled trials and systematic reviews, supports the use of increased dietary fiber (from whole grains, fruits, and vegetables) in reducing the risk of symptomatic diverticular disease and recurrence of diverticulitis.

While fiber is not typically recommended during the acute phase of diverticulitis (when a low-fiber or clear liquid diet is often prescribed to allow the colon to rest), fiber is widely recommended during the recovery and maintenance phase. Guidelines from major gastroenterological associations, such as the American Gastroenterological Association (AGA), endorse a high-fiber diet after resolution of acute inflammation.

Meta-analyses and cohort studies have shown that high-fiber diets are associated with a reduced risk of recurrent diverticulitis and may improve bowel regularity and reduce the likelihood of complications. However, the evidence is not uniformly strong for the prevention of initial diverticulitis, and some studies suggest the benefit is more pronounced in recurrence prevention.

In summary, the use of fiber for ongoing management and prevention of diverticulitis recurrence is supported by moderate to strong scientific evidence, reflected by high-quality clinical guidelines.

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