Heather states it best "You absolutely must eat insoluble fiber foods, and as much as safely possible, but within the IBS dietary guidelines. Treat insoluble fiber foods with suitable caution, and you'll be able to enjoy a wide variety of them, in very healthy quantities, without problem."
For some of us as much as safely possible means almost none. The only insoluble fiber many of us can handle is the amount in small portion of peeled and softly boiled veggies.
-------------------- STABLE: ♂, IBS-D 50+ years - Science of IBS