well, I am not sure that fiber is such a good thing after all.
for example see:
Amazon Online Reader : Fiber Menace: The Truth About the Leading Role of Fiber in Diet Failure, Constipation, Hemorrhoids, Irritable Bowel Syndrome, Ulcerative Colitis, Crohn's Disease, and Colon Cancer
I am neutral on this topic and I haven't read the book. Just wanted to add it because I spotted it recently and it may (or may not) have some truths in it.
Volkmar