The 30th Session of the Codex Committee on Nutrition and Foods for Special Dietary Use (CCNFSDU) developed a definition for dietary fiber.
Features of dietary fiber - all of the following:
(1) carbohydrate polymer
(2) >= 10 monomeric units
(3) not hydrolyzed in the human small intestine after being consumed
(4) one of the following:
(4a) naturally occurring in food
(4b) derived from foodstuff using enzymatic, chemical or other process
(4c) synthetic
In theory dietary fiber should show a beneficial effect on health by some scientific metric. It would seem that some authors dispense with this requirement.
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