Definition:
Soluble fiber is a type of fiber that dissolves in water, forming a gel-like substance that adds bulk to the stool and helps to keep it soft.
More from Dr. Bolen, your IBS Guide:
Soluble Fiber
By Barbara Bradley Bolen, Ph.D., About.com Guide
Updated February 20, 2012
About.com Health's Disease and Condition content is reviewed by our Medical Review Board
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