Why was this study done?

The importance of fiber in our diet for regularity and cholesterol control has been well studied. This study was designed to investigate the effects of a multi-fiber product on fecal volume and steroid excretion.

What did the study find?

Fiber supplements appear to have no effect on total fecal steroid excretion but do affect fecal volume.

Modification of Human Fecal Steroid Excretion by a Dietary Fiber Supplement
Authors: Story JA, et al. XIII International Congress of Nutrition, 1985.