Thanks for the excellent information Steve. I've got pdf copies of 7 or 8 large studies since 2000 that all report that grain fiber has no impact on colorectal cancer risk if anyone is interested in reading them. The only reason I can see for the continuing study of this issue is that there are many peer reviewed publications that report a protective impact of insoluble grain-derived fiber. Some are repeating this whole-grain mantra without citing a source for their "misinformation" although there are many sources out there. Best Wishes, Ron Hoggan