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I'm not sure that soluble fiber changes speed.Soluble fiber absorbs and holds onto water. So it can effect stool consistancy. If the stool is too dry the extra fiber will hold enough water in the stool to make it soft and wet enough to pass easily. It also may absorb and hold onto enough water to firm up diarrhea for some people. Firming up the diarrhea may feel like it slowed it down, but I don't think fiber actually changes the rate at which you move things through the GI tract.I've seen plenty of people both with IBS-D and IBS-C that did well on fiber here through the years. It is a pretty low risk option to try even if it may make some people worse (any type of IBS).K.
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