The Study
Brain atrophy in cognitively impaired elderly: the importance of long-chain ω-3 fatty acids and B vitamin status in a randomized controlled trial.
This study is like a science experiment where some people got vitamin pills and others got sugar pills. It found that the vitamins only helped shrink the brain slower if the person already had a lot of omega-3 in their blood. But it didn't prove the vitamins help everyone — just this one group.
Analysis score
Maximum 90 for a randomized controlled trial.
Where the score came from
B vitamins can slow brain shrinkage in older people with memory problems—but only if they already have lots of omega-3s from fish or supplements.
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 564 / 100
Quality score
Participants are randomly assigned to treatment or control groups, minimizing bias. The gold standard for testing whether an intervention causes an effect.
Key takeaways
Summary
Based on the study abstract and findings.
- 1Yes—this means taking B vitamins alone won't help unless you also have enough omega-3s, and vice versa; both nutrients need to be present to protect the brain.
- 2In people with high omega-3 levels, B vitamins slowed brain shrinkage by 40% over 2 years.
- 3In people with low omega-3 levels, B vitamins did nothing.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
The American journal of clinical nutrition
Year
2015
Authors
F. Jernerén, A. Elshorbagy, A. Elshorbagy, A. Oulhaj, Stephen M. Smith, Helga Refsum, Helga Refsum, A. Smith
Related Content
Claims (7)
To keep your brain working its best, you need enough omega-3s (found in fish and nuts) and low levels of a substance called homocysteine, which means you're getting enough B vitamins from your diet.
Taking B vitamins might help protect your brain from shrinking, but only if you already have enough omega-3s in your body—like from fish or supplements.
Omega-3s might help slow brain shrinkage in older people with memory problems, but only if they also have enough B vitamins—without enough B vitamins, omega-3s might not help at all.
For older adults with mild memory problems and low levels of omega-3 fatty acids, taking B vitamins doesn't seem to slow down brain shrinkage.
For older adults with mild memory problems and high levels of omega-3s in their blood, taking daily B vitamin pills for two years can slow brain shrinkage by 40% compared to taking a placebo — but only if they already have lots of omega-3s in their system.
Taking B vitamins might help slow brain shrinkage in older people with mild memory problems—but only if they also have enough omega-3s in their body. If they don’t, the B vitamins might not help as much.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.