By Dr. Liji Thomas, MD Reviewed by Lauren Hardaker Jun 30 2026 Adults with chronic functional constipation experienced more frequent bowel movements and better stool consistency after taking a blend of dietary fibers from multiple food sources in a placebo-controlled trial. Study: Combination of Dietary Fibers From Different Food Origins as a Treatment for Adults With Functional Constipation: A Randomized Clinical Trial . Image credit: triocean/Shutterstock.com A recent study in the journal