A lot of our digestive flora actually uses "non-digestible" components for sustenance, we're finding. There can be surprising and unexpected side effects to eli

A lot of our digestive flora actually uses "non-digestible" components for sustenance, we're finding. There can be surprising and unexpected side effects to eliminating food components we thought we just excreted. Fiber, for instance, is technically not all digested -- much just passes through -- but it's really important! Other types of fiber are fermented in the gut depending on what bacteria you've got.