Cognitive benefits from fermented foods remain unproven
Many studies reported favorable memory and thinking results, but the review judged the evidence insufficient to show that fermented foods caused those benefits.
Based on the published abstract. The full paper may contain additional methods, results and limitations.
The 30-second takeaway
Most studies reported favorable cognitive outcomes involving foods fermented with Lactobacillus or Bifidobacterium. However, the review found insufficient evidence that these foods caused the reported benefits. Positive results across studies do not settle that question when study design, food descriptions and cognitive testing leave important uncertainties about what was measured and compared.
The abstract identifies small samples, inadequate controls, short interventions and inconsistent cognitive testing. Observational studies also had problems assessing food exposure, and food descriptions were incomplete.
Different kinds of evidence
The review combined intervention studies with observational research. Reported benefits often involved memory for events, higher-level thinking skills and overall cognition. Uneven assessment across these areas made it difficult to build a consistent picture.
Food details matter
The review concerned foods fermented with the named bacteria in healthy adults or people with mild cognitive impairment. Incomplete food descriptions leave uncertainty about which product characteristics could be relevant to the reported cognitive results.
The original publication
The effects of Lactobacillus and/or Bifidobacterium in fermented foods on cognitive health: a systematic review.
Harsa HS, González Domenech CM, Prvulović M et al.
Front Nutr · 2025
- PubMed ID
- 41415845
- Record checked
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