Polyphenols from Grape and Blueberry Improve Episodic Memory in Healthy Elderly with Lower Level of Memory Performance: A Bicentric Double-Blind, Randomized, Placebo-Controlled Clinical Study

Julien Bensalem, Stéphanie Dudonné, Nicole Etchamendy, Hermine Pellay, Camille Amadieu, David Gaudout, Séverine Dubreuil, Marie-Eve Paradis, Sonia Pomerleau, Lucile Capuron, Carol Hudon, Sophie Layé, Yves Desjardins, Véronique Pallet

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Polyphenols are promising nutritional bioactives exhibiting beneficial effect on age-related cognitive decline. This study evaluated the effect of a polyphenol-rich extract from grape and blueberry (PEGB) on memory of healthy elderly subjects (60-70 years-old). A bicentric, randomized, double-blind, placebo-controlled trial was conducted with 215 volunteers receiving 600 mg/day of PEGB (containing 258 mg flavonoids) or a placebo for 6 months. The primary outcome was the CANTAB Paired Associate Learning (PAL), a visuospatial learning and episodic memory test. Secondary outcomes included verbal episodic and recognition memory (VRM) and working memory (SSP). There was no significant effect of PEGB on the PAL on the whole cohort. Yet, PEGB supplementation improved VRM-free recall. Stratifying the cohort in quartiles based on PAL at baseline revealed a subgroup with advanced cognitive decline (decliners) who responded positively to the PEGB. In this group, PEGB consumption was also associated with a better VRM-delayed recognition. In addition to a lower polyphenol consumption, the urine metabolomic profile of decliners revealed that they excreted more metabolites. Urinary concentrations of specific flavan-3-ols metabolites were associated, at the end of the intervention, with the memory improvements. Our study demonstrates that PEGB improves age-related episodic memory decline in individuals with the highest cognitive impairments.

Original languageEnglish
Pages (from-to)996-1007
Number of pages12
JournalJournals of Gerontology - Series A Biological Sciences and Medical Sciences
Volume74
Issue number7
Early online date19 Jul 2018
DOIs
Publication statusPublished - 18 Jun 2019
Externally publishedYes

Keywords

  • Aging
  • CANTAB
  • Cognition
  • Flavan-3-ols
  • PAL

ASJC Scopus subject areas

  • Ageing
  • Geriatrics and Gerontology

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