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On defining dietary fibre
1Medallion Laboratories, Minneapolis, MN, USA. info@medlabs.com
The Proceedings of the Nutrition Society
|May 13, 2003
Summary
A new definition for dietary fibre clarifies its components and function, aligning with previous research. Existing analytical methods are largely sufficient, with minor updates for specific fibres like fructans.
Area of Science:
- Nutrition Science
- Food Analysis
- Analytical Chemistry
Background:
- Historically, dietary fibre definitions balanced nutritional understanding with analytical capabilities.
- Reliance on analytical procedures created discrepancies between theoretical and practical definitions of dietary fibre.
- This led to confusion regarding the precise components and physiological roles of dietary fibre.
Purpose of the Study:
- To review and update the definition of dietary fibre.
- To assess the current state of analytical methodology for dietary fibre determination.
- To provide recommendations for an updated definition and associated methods.
Main Methods:
- An expert scientific review committee was convened by the American Association of Cereal Chemists (AACC).
- The committee deliberated on the definition of dietary fibre and evaluated analytical methods.
- Existing AACC and AOAC methods were assessed for their continued suitability.
Main Results:
- An updated definition of dietary fibre was adopted, maintaining consistency with the previous 30-year working definition.
- The new definition more clearly outlines the composition and physiological functionality of dietary fibre.
- Current analytical methods (e.g., AACC 32-05, AOAC 985.29, AACC 32-07, AOAC 991.43) remain sufficient for most foods.
Conclusions:
- The updated dietary fibre definition enhances clarity without necessitating major changes to established research.
- Few analytical method modifications are required, ensuring continuity in dietary fibre analysis.
- Additional methods may be needed for quantifying novel fibres like fructans and synthetic analogues.
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