Subjects (N=189, 77% female, 92% white, (age = 58 years, SD = 14) with fecal incontinence were randomly assigned to placebo or a supplement of 16g total dietary fiber/day from one of three sources: gum arabic, psyllium, or carboxymethylcellulose. They reported GI symptoms daily during baseline (14 days), incremental fiber dosing (6 days), and two segments of steady full fiber dose (32 days total).