Effects of Consumption of Nut Components on Cognitive Function, Intestinal

Status Completed

Clinical Trial Summary

Tree nuts (for example brazil nuts, almonds, hazelnuts, walnuts, cashew nuts etc) contain a wide variety of nutrients including fatty acids, polyphenols and micronutrients. The beneficial health effects ascribed to the consumption of tree nuts include improvements to cardiovascular outcomes and regulation of glucose levels and inflammation. Emerging evidence suggests that specific components of nuts may also contribute to brain health and function.

The aim of the present study is to assess the effects of four weeks' supplementation of nut components on cognition and subjective measures. Urinary metabolites and intestinal microbial communities will also be assessed allowing biomarkers of nut exposure to be highlighted.

Clinical Trial Description

To date, only two small human intervention trials have evaluated the effects of nuts as a sole intervention on cognition. One study reported a benefit verbal fluency and constructional praxis following daily consumption of 6 g brazil nuts for 6 months in older adults diagnosed with mild cognitive impairment. Eight weeks' consumption of 60 g/d walnuts in healthy young adults aged 18-25 years also resulted in improved inferential verbal reasoning scores compared to placebo.

The development of various 'omics' technologies has enabled researchers to investigate the influence of nutrients or dietary change on metabolic pathways at multiple levels with a view to developing biological markers of dietary intake.

Metabolomic approaches have been used successfully to study nut consumption; for example putative biomarkers of nut consumption have been revealed as metabolites associated with serotonin pathways. Furthermore, certain nut biomarkers identified using metabolomics appear to be negatively associated with health parameters which is suggested to be due to gut microbiota dysbiosis and provides an important link between nut consumption, the gut microflora and metabolic pathways.

This study will assess the effects of four weeks' supplementation with nut components on cognition. Metabolomic and metagenomic approaches will be utilised to analyse urinary metabolites and intestinal microbial communities allowing biomarkers of nut exposure to be highlighted. Metabolic and gut microbiota responses will then be correlated with changes in cognition in order to identify inter-individual differences in response, and further understanding of the mechanisms underpinning cognitive benefits of nut consumption. ;

Study Design

Related Conditions & MeSH terms

Clinical Trial Details

NCT number	NCT03500601
Study type	Interventional
Source	Northumbria University
Contact
Status	Completed
Phase	N/A
Start date	November 22, 2017
Completion date	October 19, 2018

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Clinical trials are conducted in a series of steps, called phases - each phase is designed to answer a separate research question.

Phase 1: Researchers test a new drug or treatment in a small group of people for the first time to evaluate its safety, determine a safe dosage range, and identify side effects.
Phase 2: The drug or treatment is given to a larger group of people to see if it is effective and to further evaluate its safety.
Phase 3: The drug or treatment is given to large groups of people to confirm its effectiveness, monitor side effects, compare it to commonly used treatments, and collect information that will allow the drug or treatment to be used safely.
Phase 4: Studies are done after the drug or treatment has been marketed to gather information on the drug's effect in various populations and any side effects associated with long-term use.

Effects of Consumption of Nut Components on Cognitive Function, Intestinal Microbial Communities and Markers of Health

Clinical Trial Summary

Clinical Trial Description

Study Design

Related Conditions & MeSH terms