A big reason we need SF and IF is for the nutrition in those foods. IF foods especially have a lot of needed nutrients. If you get so much fiber from a fiber supplement it shouldn't take the place of real fruits and vegetables. There is nothing wrong with the idea of ingesting IF and SF together; that is a good plan. But it is better to eat IF than supplement with it.
-------------------- IBS-A for 20 years with terrible bloating and gas. On the diet since April 2004. Remember this from Heather's information pages:
"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." Please eat IF foods!