"Fiber supplementation is moderately effective for treating chronic idiopathic constipation, but also causes moderate gastrointestinal side effects, according to the results of a systematic review and meta-analysis."
“Chronic idiopathic constipation is a common symptom-based disorder,”Stephanos Christodoulides, MSc, a doctoral researcher at the Wingate Institute for Neurogastroenterology and GI Physiology Unit, Center for Neuroscience and Trauma, Blizard Institute, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, told Healio Gastroenterology. “Fiber supplements are commonly used and are recommended as first-line management strategy,” however, “there has been no definitive quantitative summary of available evidence on the efficacy of fiber.”