I don't think you could place too much emphasis on the importance of eating enough fibre. It's essential to good health, and not just because it helps keep us "regular".
We need about 30 grams of fibre a day. The average Briton gets about 12 grams.
New research at the University of Leeds has shown that fibre can reduce the risk of breast cancer in younger women. However, eating fibre does not seem to have the same cancer-reducing effect on post-menopausal women who are overweight or obese, as they have a greater risk of breast cancer.
You can read more about the research here.