Cited by 94Food composition and propertiesSeed and Plant BiochemistryNatural Antidiabetic Agents Studies

The effects of whole-grain compared with refined wheat, rice, and rye on the postprandial blood glucose response: A systematic review and meta-analysis of randomized controlled trials

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Musa-Veloso, Kathy, Poon, Theresa, Harkness, Laura S, O'Shea, Marianne, Chu, YiFang·2018·The American Journal of Clinical Nutrition

Abstract

Background Whole grains are often referred to collectively, despite differences in their composition, physical structure, processing, and potential health benefits.Objective The aim of this study was to compare the postprandial blood glucose response of whole-grain with refined wheat, rice, or rye, while controlling for the food delivery matrix and the processing of the grain (e.g., grinding, germination).Design Eleven electronic databases were systematically searched to identify studies published up to and including November 2017. Randomized controlled trials comparing the effects of whole-grain wheat, rice, or rye with those of each grain's refined counterpart on postprandial blood glucose area under the curve (AUC) were included. Pooled effect sizes were computed by using the difference in the blood glucose AUC after the consumption of the whole compared with the refined grain.Results Twenty publications were included, with 10, 14, and 5 strata (or active-control comparisons) on whole-grain wheat, rice, and rye, respectively. The consumption of ground (wholemeal) wheat, compared with white wheat, was not associated with a significant reduction in blood glucose AUC (-6.7 mmol/L ⋅ min; 95% CI: -25.1, 11.7 mmol/L ⋅ min; P = 0.477). The consumption of wholemeal rye, compared with endosperm rye, was not associated with a significant reduction in blood glucose AUC (-5.5 mmol/L ⋅ min; 95% CI: -24.8, 13.8 mmol/L ⋅ min; P = 0.576). The consumption of intact (whole-grain) rice, compared with white rice, was associated with a significant reduction in blood glucose AUC (-40.5 mmol/L ⋅ min; 95% CI: -59.6, -21.3 mmol/L ⋅ min; P < 0.001).Conclusions Compared with white rice, whole-grain rice significantly attenuates the postprandial blood glucose response. In most of the studies on wheat and rye, the postprandial blood glucose responses to foods formulated with wholemeal compared with refined flours were compared. Whether reductions in the blood glucose AUC can be achieved with whole-grain (as opposed to wholemeal) wheat and rye requires further investigation.

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  1. Noriega E, Bouix O, Brun JF, Mestres C, Gauthier J, Orsetti A. Glycaemic and insulinaemic responses to white, brown and germinated rices in healthy subjects. Diabetes Nutr Metab 1993;6:215-21.

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Authors
Musa-Veloso, K., Poon, T., Harkness, L. S., O'Shea, M., & Chu, Y.
Affiliations
  • Intertek (Canada) (CA)
  • Church & Dwight (United States) (US)
  • Pepsi (United States) (US)
Venue
The American Journal of Clinical Nutrition
Publisher
Elsevier BV
Published
2018-10
Volume
108
Issue
4
Pages
759-774
ISSN
0002-9165 (ISSN-L)
OpenAlex
W2897187607
Cited by
94
References
42
Citations by year
2026: 10 · 2025: 19 · 2024: 12 · 2023: 12 · 2022: 13 · 2021: 12 · 2020: 9 · 2019: 7
FWCI
0.90
Type
journal article
Language
en
Open access
Locations
  • American Journal of Clinical Nutrition (publishedVersion)
  • PubMed (publishedVersion)
Funders
PepsiCo
Topics
  • Health Sciences › Nursing › Nutrition and Dietetics › Food composition and properties
  • Life Sciences › Agricultural and Biological Sciences › Food Science › Seed and Plant Biochemistry
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Natural Antidiabetic Agents Studies
Keywords
whole grains, refined grains, postprandial blood glucose, whole grain rice, white rice, white wheat, grain processing, glycemic response, dietary fiber, food matrix effects, germination, grinding
MeSH terms
Whole Grains, Adult, Aged, Blood Glucose, Bread, Dietary Fiber, Female, Flour, Humans, Male, Middle Aged, Oryza, Secale, Triticum, Postprandial Period, Young Adult

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