Nut Consumption Improves Cognitive Function and Modulates Gut Bacteria, New Study Suggests
Mixed Tree Nuts, Cognition and Gut Microbiota: a 4-week, Placebo-Controlled, Randomized Crossover Trial in Healthy Non-Elderly Adults
Abstract
Background
Beneficial effects of nut supplementation on cognitive function have previously been demonstrated in young and older adults. Alterations to gut microbiota have also been shown following tree nut consumption. However, no data exists on the effects of nuts on cognition and intestinal microbial communities assessed within the same study.
Objectives
The study aimed to examine the effects of daily consumption of tree nuts for four weeks on cognitive function (primary outcome), mood, metabolomics, and gut microbial species (secondary outcomes) in healthy, non-elderly adults.
Methods
This randomized, placebo-controlled, double-blind, counterbalanced crossover study assessed the effects of four weeks’ supplementation with 30 g/d mixed tree nuts versus placebo on cognition and mood in 79 healthy 18–49 year old adults. Metabolic responses, gut bacterial community structure and the potential for these to impact cognition were explored using a multi-omic approach. Bacterial community analysis was conducted in QIIME2.
Results
Mixed model analysis indicated that nut consumption led to significant improvements to accuracy (placebo M = 92.2% vs. NUTS M = 94.5%; p = 0.019) and speed of response (placebo M = 788 ms vs. NUTS M = 757 ms; p = 0.004) on a picture recognition task. No significant changes to bacterial community alpha or beta diversity were observed when comparing nut consumption to the placebo arm. However, an unclassified Lachnospiraceae amplicon sequence variant (ASV) was significantly enriched in participants when supplemented with nuts (p = 0.015). No correlations were observed between the changes to picture recognition and the changes to the unclassified Lachnospiraceae ASV. There were no significant changes to the urinary metabolome.
Conclusions
These findings indicate a positive effect of nut on cognition following only 4-weeks’ consumption in a healthy non-elderly sample, as well as upregulation of a microbial taxa associated with gut health. The effects appear to be independent of one another, but further exploration is required in those experiencing cognitive decline and/or gut dysbiosis.
The study was registered at clinicaltrials.gov (identifier: NCT03500601).
Notes
This study was supported by funding from the INC International Nut and Dried Fruit Council.
The study was registered at clinicaltrials.gov (identifier: NCT03500601).
Data described in the manuscript will be made available upon request.
Supplementary Figure 1 and Supplementary Tables 1 and 2 are available from the “Online Supporting Material” link in the online posting of the article and from the same link in the online table of contents at http://jn.nutrition.org.
Abbreviations used: COMPASS, computerized mental performance assessment system; PLA, placebo
Source: https://academic.oup.com/jn/advance-article/doi/10.1093/jn/nxac228/6750235?login=false
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