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Effects of a beetroot juice with high neobetanin content on the early-phase insulin response in healthy volunteers

Lookup NU author(s): Dr Kirsten BrandtORCiD, Sarah Warner



This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


Produce rich in phytochemicals may alter postprandial glucose and insulin responses by interacting with the pathways that regulate glucose uptake and insulin secretion in humans. The aims of the present study were to assess the phytochemical constituents of red beetroot juice and to measure the post- prandial glucose and insulin responses elicited by either 225 ml beetroot juice (BEET), a control beverage matched for macronutrient content (MCON) or a glucose beverage in healthy adults. Beetroot juice was a particularly rich source of betalain degradation compounds. The orange/yellow pigment neobetanin was measured in particularly high quantities (providing 1·3 g in the 225 ml). A total of sixteen healthy individuals were recruited, and consumed the test meals in a controlled single-blind cross-over design. Results revealed a significant lowering of the postprandial insulin response in the early phase (0–60 min) (P < 0·05) and a significantly lower glucose response in the 0–30 min phase (P < 0·05) in the BEET treatment compared with MCON. Betalains, polyphenols and dietary nitrate found in the beetroot juice may each contribute to the observed differences in the postprandial insulin concentration.

Publication metadata

Author(s): Wootton-Beard PC, Brandt K, Fell D, Warner S, Ryan L

Publication type: Article

Publication status: Published

Journal: Journal of Nutritional Science

Year: 2014

Volume: 3

Online publication date: 30/04/2014

Acceptance date: 14/02/2014

Date deposited: 02/12/2014

ISSN (electronic): 2048-6790

Publisher: Cambridge University Press


DOI: 10.1017/jns.2014.7

PubMed id: 25191617


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