The Study
Effect of milk and dairy intake on cognitive function in older adults: a systematic review and meta-analysis
This study looked at lots of smaller experiments and found that when older people ate special kinds of yogurt or milk with added good stuff, their brains seemed to work a little better. But it didn't prove that regular milk or cheese makes your brain better — only those special types in controlled tests.
Analysis score
Maximum 85 for a systematic review with meta-analysis.
Where the score came from
Some kinds of dairy, like yogurt and cheese, might help older adults think better, but regular milk doesn't seem to help—and might even hurt a little.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 547 / 100
Quality score
Systematic reviews and meta-analyses of cohort studies. They sit above a single cohort study but below a single randomized trial, because the underlying evidence is still observational.
Key takeaways
Summary
Based on the study abstract and findings.
- 1A 0.45 improvement is meaningful—it’s like moving from average to slightly above-average thinking ability after a few months of eating probiotic dairy.
- 2Fermented dairy (like probiotic milk or cheese) improved thinking skills by 0.45 standard deviations in trials.
- 3Regular milk and dairy showed no benefit (OR=0.95).
- 4High whole milk intake linked to worse memory (Δ = −0.10).
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Frontiers in Aging
Year
2026
Authors
Y. Giraldo-Castrillon, Juan Diego Mendoza, M. Lopez-Cabrera, J. Lopez-Lopez, Patricio López-Jaramillo
Related Content
Claims (6)
People who eat cheese have a lower incidence of dementia compared to those who do not.
Older adults who consume large amounts of whole milk show lower cognitive test scores and worse overall cognitive performance compared to those who consume less.
Adults aged 60 and older who consume probiotic-fermented milk or whey protein supplements show a moderate improvement in overall cognitive function compared to those who do not, based on pooled results from five controlled trials.
Eating typical dairy foods like milk and cheese does not change cognitive function in older adults.
In older adults, measurable cognitive effects from dairy products occur only with controlled interventions using specific fermented or fortified dairy products, not from regular dietary consumption.
Older adults who consume fermented dairy products like probiotic-fermented milk show better verbal memory and sustained attention compared to those who do not, based on measured cognitive test results.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.