This method determines insoluble, soluble, and total dietary fiber, as defined by the Codex Alimentarius Commission. It is applicable to plant material, foods, and food ingredients consistent with the Codex Alimentarius Commission Definition adopted in 2009 (ALINORM 09/32/REP) and modified slightly in 2010 (ALINORM 10/33/REP), including naturally occurring, isolated, modified, and synthetic polymers meeting the definition.