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https://www.healthline.com/nutrition/fiber-and-constipation-truth#section3
>other studies show that reducing your intake is best (15). Also, a recent review found that although fiber was effective at increasing the number of bowel movements, it didn't help with other symptoms of constipation like stool consistency, pain, bloating and gas (6).
>One 6-month study in 63 people found that for people with chronic idiopathic constipation, a low-fiber or even a no-fiber diet drastically improved their symptoms. Removing the fiber basically cured them of the constipation (18).
>https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3435786/
>Stopping or reducing dietary fiber intake reduces constipation and its associated symptoms
>There is recent evidence that low fiber intake does not equate to constipation[9]. Patients with chronic constipation also have similar fiber intake to controls[10-13]. Patients with chronic constipation may also have worsening symptoms when dietary fiber intake is increased[14]. Another study found that lactulose was more effective in easing constipation when compared with fiber[15].