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What is dietary fiber?

L Prosky1

  • 1L. Prosky Associates, Rockville, MD 20850-3507, USA.

Journal of AOAC International
|September 20, 2000
PubMed
Summary

The current definition of dietary fiber is sufficient, but new methods are needed to accurately measure all its components, including resistant oligosaccharides. This ensures a comprehensive understanding of dietary fiber

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Area of Science:

  • Nutritional Science
  • Food Chemistry

Background:

  • Dietary fiber comprises plant cell remnants, polysaccharides, and lignin resistant to human digestive enzymes.
  • The physiological definition of dietary fiber is currently assessed using AOAC Method 985.29.

Observation:

  • The AOAC Method 985.29 fails to detect certain hydrolysis-resistant oligosaccharides with physiological fiber properties.
  • Substances with 10, 11, and 12 degrees of polymerization are missed by the current chemical method.
  • Key components like inulin, oligofructose, indigestible dextrin, galactooligosaccharides, and polydextrose are not fully accounted for.

Findings:

  • A committee is exploring expanded definitions and methodologies for dietary fiber.
  • The review suggests the existing definition is adequate.
  • New methodologies are required to accurately detect all physiologically relevant dietary fiber components.

Implications:

  • Accurate measurement of diverse dietary fiber components is crucial for understanding their health benefits.
  • Refined analytical methods will improve nutritional assessments and food product analysis.
  • This research supports the development of more comprehensive dietary guidelines and food labeling.

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