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

Authors Organisations
  • Peter Wootton-Beard(Author)
    Oxford Brookes University
  • Kirsten Brandt(Author)
    Newcastle University
  • David Fell(Author)
    Oxford Brookes University
  • Sarah Warner(Author)
    Oxford Brookes University
  • Lisa Ryan(Author)
    Oxford Brookes University
Type Article
Original languageEnglish
Article numberE9
Number of pages9
JournalJournal of Nutritional Science
Volume3
Issue numbere9
DOI
Publication statusPublished - 14 Feb 2014
Externally publishedYes
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Abstract

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 postprandial 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.

Keywords

  • postprandial glycaemia, phytochemicals, betalains