Mediterranean diet shifts metabolic markers in an interim MCI analysis

In 47 older adults with mild cognitive impairment, a 24-week Mediterranean-diet intervention changed several plasma metabolites; some metabolite changes correlated with cognitive scores. Correlation does not establish cognitive benefit.

By Nootropik News Editorial Team News/source date: 17 August 2026 Published: 5 October 2026 · 02:57 (UTC+3) Updated: 5 October 2026 · 02:57 (UTC+3)

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Study design

This interim analysis included 47 adults aged 60 or older with mild cognitive impairment in a 24-week trial of a Mediterranean diet, Mediterranean diet plus probiotics, or a low-fat diet. Researchers measured targeted plasma metabolites and compared changes with ADAS-Cog-11 and a neuropsychological test battery.

Findings

The Mediterranean-diet arms showed higher acetoacetic acid and several tricarboxylic-acid-cycle metabolites, and lower branched-chain amino acids, especially isoleucine. Changes in several metabolites correlated with better cognitive scores. These correlations do not prove that the diet improved cognition through a metabolic pathway, and plasma measurements do not directly measure brain metabolism.

Limitations and disclosures

The sample was small and this was an interim mechanistic analysis, not a definitive clinical-outcome report. Many metabolite and cognitive comparisons were assessed. The abstract does not establish a cognitive benefit or clarify whether probiotics changed the dietary response. Funding and competing-interest disclosures were not visible in the accessible abstract.

This sourced news summary and translation were prepared with AI assistance. Source links, the news date and research limitations are disclosed; this is not a claim of independent medical expert review. News production method.

Sources

Enhanced metabolic flexibility links Mediterranean diet with cognition: interim findings from a randomized controlled trial — Food & Function · 17 August 2026

Research news is not medical advice or a recommendation to use a substance. Read findings in the context of the study design, participants and limitations. Editorial standards.

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