Diet

In which Rat dismisses worries

Fact check: technically true

While definitions of what exactly constitutes «fiber» differ slightly (see wiki for details), cellulose and lignins are as a rule included; and a piece of wood could indeed serve as a source of those, provided your incisors are strong and sharp enough.

As a corollary, if something is advertised as «rich in fiber», it isn’t telling much. Two good questions to ask would be «what sort of fiber?» and «did it lack other benefits to advertise?».