A biphasic response to blueberry supplementation on depressive symptoms in emerging adults: a double-blind randomized controlled trial

Velichkov, M. ORCID: https://orcid.org/0000-0003-2804-8973, Bezur, Z., Van Reekum, C. M. ORCID: https://orcid.org/0000-0002-1516-1101 and Williams, C. M. ORCID: https://orcid.org/0000-0003-4452-671X (2024) A biphasic response to blueberry supplementation on depressive symptoms in emerging adults: a double-blind randomized controlled trial. European Journal of Nutrition. ISSN 1436-6215 doi: 10.1007/s00394-023-03311-9

Abstract/Summary

The aim of the present study was to examine the acute and chronic effects of wild blueberry supplementation on mood, executive function, and serum biomarkers of neuroplasticity, inflammation, and oxidative stress in emerging adults with moderate-to-severe depressive symptoms. In this double-blind trial, 60 emerging adults (M  = 20.0 years, 32% male) with self-reported depressive symptoms were randomly assigned to receive a single blueberry drink (acute phase), followed by 6 weeks of daily blueberry supplementation (chronic phase), or a matched placebo drink. The primary outcome was Beck Depression Inventory-II (BDI-II) scores at 6-week follow-up. Further measures included momentary affect (PANAS-X) and accuracy on an executive function task. The data were analyzed using ANCOVAs adjusted for baseline values, sex, and habitual fruit and vegetable intake. Estimated marginal means were calculated to compare the treatment arms. The blueberry drink significantly improved positive affect (p = 0.026) and executive function (p = 0.025) at 2 h post-ingestion, with change scores being positively correlated in the blueberry group (r = 0.424, p = 0.017). However, after six weeks of supplementation the reduction in BDI-II scores was greater in the placebo group by 5.8 points (95% CI: 0.8-10.7, p = 0.023). Generalized anxiety and anhedonia also decreased significantly more in the placebo group. No significant differences were found for any of the biomarkers. Six weeks of wild blueberry supplementation were inferior to placebo in reducing depressive symptoms. Nevertheless, the correlated improvements in positive affect and executive function after a single dose of blueberries point to a beneficial, albeit transient, psychological effect. These contrasting results suggest a biphasic, hormetic-like response that warrants further investigation.

Item Type	Article
URI	https://reading-clone.eprints-hosting.org/id/eprint/115224
Identification Number/DOI	10.1007/s00394-023-03311-9
Refereed	Yes
Divisions	Life Sciences > School of Psychology and Clinical Language Sciences > Department of Psychology
Uncontrolled Keywords	Executive function, Blueberries, Randomized controlled trial, Anthocyanins, Depression
Publisher	Springer
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