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Does Fiber Help With Constipation? What Actually Works

Fiber relieves constipation, but only the right kind works. The research points to soluble, gel-forming, slow-to-ferment fiber—psyllium has the strongest evidence, raising bowel movements by about three per week in trials. Pairing it with gentler fibers like PHGG and acacia softens stool while staying easy on a sensitive gut. The keys: take enough (10g+ psyllium daily), drink water with every dose, ramp up slowly to avoid bloating, and give it 2–4 weeks. Here's what the studies actually show, and how to start without trading constipation for gas.