Dietary Reference Intakes Proposed Definition of Dietary Fiber (2001) / Chapter Skim
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V. Impact of the Definitions of Dietary Fiber and Unresolved Issues
V. Impact of the Definitions of Dietary Fiber and Unresolved Issues
Pages 26-33
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From page 26... ...
Current methodology, including approaches for specific Added Fibers, are reviewed ~ Appendix C, with overall approaches outlined below. Several changes to current methods are needed to obtain values for Dietary Fiber.
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From page 27... ...
Consideration should be given to methods that not only determine resistant starch, but also measure digestible or total starch in the same assay so that a portion of the total starch is not recovered in more than one starch fraction. Naturally occurring oligosaccharides inherent in foods containing Dietary Fiber need to be captured during analysis.
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From page 28... ...
subtract nondigestible, animal-derived carbohydrate add lignin add naturally occurring resistant starch add naturally occurring oligosaccharides The fibers that are included in the definition of Added Fiber could be analyzed using methods for each specific compound that have been or could be developed, generally using GC or HPLC for quantitation after the Added Fiber has been isolated, typically by chromatography or dialysis. In some instances, Added Fiber could be determined enzymatically, for example, as mixed linkage pglucan is now (McCleary and Codd, 1991~.
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From page 29... ...
An additional analysis to measure naturally occurring resistant starch would be needed for foods. For foods containing oligosaccharides or other ethanol soluble carbohydrates, an additional step would be needed whereby these carbohydrates would be recovered from He ethanol on the basis of molecular weight, using column chromatography or dialysis; they could be combined with the fiber-derived carbohydrates for quantitative analysis.
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From page 30... ...
Although the proposed definitions do not outline the nature and extent of demonstrating a beneficial health effect for Added Fiber, it is anticipated that research designs used to characterize the established physiological effects on taxation and blood glucose and cholesterol concentrations can form the basis for developing standard protocols and criteria to determine whether an Added Fiber demonstrates one of these beneficial physiological effects. In addition, the possibility of using analytically determined viscosity and fermentability as part of the evaluation process needs to be explored.
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From page 31... ...
Several areas are emerging as potential physiological effects of Dietary Fiber and Added Fiber. More research could be conducted on the potential use of Dietary Fiber and Added Fiber in weight control, as certain fibers reduce food intake and possibly the amount of metabolizable energy available.
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From page 32... ...
This could lead to increased utilization of natural plant foods in food products, which is in keeping with recent dietary recommendations to consume more grains, especially whole grain, fruits, and vegetables (Health Canada, 1997b; USDA/DHHS, 2000~. Since the proposed definition of Dietary Fiber includes naturally occurring resistant starch, starchy foods such as legumes or pasta may also be utilized to a greater extent in food products to provide Dietary Fiber.
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From page 33... ...
Since it is recommended that the current designations "soluble" and "insoluble" dietary fiber be eliminated from the label, their removal will provide space for the inclusion of Dietary Fiber and Added Fiber. As discussed earlier, a separate issue regarding nutrition labeling centers on accurate analytical verification of the division of Total Fiber into Dietary Fiber and Added Fiber.
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