They aren't necessarily linked.Some people with IBS have odor problems, but you can have serious odor problems for other reasons.Some people with IBS have no problem with odor.Bile binding agents are fairly regularly discussed, but you might see it more under the brand name Questran or the generic name rather than that brand. Although a search for Welchol indicates it gets mentioned every so often see: http://www.ibsgroup.org/forums/index.php?a...lite=%2BwelcholTMAU or "fish odor" can have other smells other than fishy, and it isn't a fresh fishy smell but a rotted smell that can be fecal.If it is just regular body odor than controlling the bacteria may help as a lot of that comes from how the bacteria break down stuff that comes out in the sweat.A lot of health problems do tend to track together, even if they are unrelated. The physical stress of one can often set the other one off.