Re-evaluation of the mechanisms of dietary fibre and implications for macronutrient bioaccessibility, digestion and postprandial metabolism

Grundy, Myriam M. -L., Edwards, Cathrina H., Mackie, Alan R., Gidley, Michael J., Butterworth, Peter J. and Ellis, Peter R. (2016) Re-evaluation of the mechanisms of dietary fibre and implications for macronutrient bioaccessibility, digestion and postprandial metabolism. British Journal of Nutrition, 116 5: 816-833. doi:10.1017/S0007114516002610


Author Grundy, Myriam M. -L.
Edwards, Cathrina H.
Mackie, Alan R.
Gidley, Michael J.
Butterworth, Peter J.
Ellis, Peter R.
Title Re-evaluation of the mechanisms of dietary fibre and implications for macronutrient bioaccessibility, digestion and postprandial metabolism
Journal name British Journal of Nutrition   Check publisher's open access policy
ISSN 1475-2662
0007-1145
Publication date 2016-09-01
Sub-type Article (original research)
DOI 10.1017/S0007114516002610
Open Access Status DOI
Volume 116
Issue 5
Start page 816
End page 833
Total pages 18
Place of publication Cambridge, United Kingdom
Publisher Cambridge University Press
Language eng
Subject 2701 Medicine (miscellaneous)
2916 Nutrition and Dietetics
Abstract The positive effects of dietary fibre on health are now widely recognised; however, our understanding of the mechanisms involved in producing such benefits remains unclear. There are even uncertainties about how dietary fibre in plant foods should be defined and analysed. This review attempts to clarify the confusion regarding the mechanisms of action of dietary fibre and deals with current knowledge on the wide variety of dietary fibre materials, comprising mainly of NSP that are not digested by enzymes of the gastrointestinal (GI) tract. These non-digestible materials range from intact cell walls of plant tissues to individual polysaccharide solutions often used in mechanistic studies. We discuss how the structure and properties of fibre are affected during food processing and how this can impact on nutrient digestibility. Dietary fibre can have multiple effects on GI function, including GI transit time and increased digesta viscosity, thereby affecting flow and mixing behaviour. Moreover, cell wall encapsulation influences macronutrient digestibility through limited access to digestive enzymes and/or substrate and product release. Moreover, encapsulation of starch can limit the extent of gelatinisation during hydrothermal processing of plant foods. Emphasis is placed on the effects of diverse forms of fibre on rates and extents of starch and lipid digestion, and how it is important that a better understanding of such interactions with respect to the physiology and biochemistry of digestion is needed. In conclusion, we point to areas of further investigation that are expected to contribute to realisation of the full potential of dietary fibre on health and well-being of humans.
Keyword Bioaccessibility
Dietary fibre
Food structure
Gastrointestinal functions
Plant cell walls
Q-Index Code C1
Q-Index Status Provisional Code
Grant ID BB/H004866/1
BB/L025272/1
BB/M021076/1
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
Centre for Nutrition and Food Sciences Publications
 
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