In general, for healthy people, who have no GI problems, fiber is usually a good thing. However there is also a lot of hype about how it must be the bestest thing ever for all people. It isn't the miracle it gets proclaimed to be. It is just one more thing food companies can add to food to make it sound like they care about your health. If it helps it sell more, they will add whatever is the hype of the moment.Nothing is only a good thing or a bad thing. Pretty much everything can be bad for some people in some amount. Usually once something get the it is totally good for you hype, someone will put out a "it is the worst thing ever" book. The truth usually is somewhere in between.Now maybe hundreds of IBSers reporting on this site that increasing fiber causes them problem means nothing and all of them are lying or something, but it does seem that an awful lot of people with IBS (and some other GI problems) find that increasing fiber makes their symptoms worse. Enough that it seems to be real, but it may not be enough for you to think it is real.Generally in the clinical trials for fiber use in IBS patients they show that it sometimes help and sometimes makes things worse and the conclusions usually are that if it makes things more normal for you then it is a pretty safe thing to take, but it may make things worse so don't take it if it makes things worse.Some people with Ulcerative colitis used to use Ensure when they needed to go on a fiber free diet for a few weeks to allow the colon to heal. I don't know what they will use now.