The Study
Effect of Statin Therapy on Cognitive Decline and Incident Dementia in Older Adults
This study watched a bunch of older people over time to see if taking statins changed how well their brains worked. It found no clear link, but since people chose whether to take statins themselves, other things—like how healthy they were overall—could have affected the results. So we can't say statins cause brain changes, only that they might not be linked.
Analysis score
Maximum 72 for a cohort study.
Where the score came from
This study looked at older people taking statins to see if they lost their memory or got dementia faster.
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 559 / 100
Quality score
Groups of people are followed over time to see who develops an outcome. Strong for identifying risk factors and associations, but cannot prove causation as firmly as RCTs.
Key takeaways
Summary
Based on the study abstract and findings.
- 1For most older adults, statins didn't make memory worse over time — but if someone already had mild memory issues, statins might be linked to higher dementia risk, possibly because they were prescribed statins due to early signs of decline.
- 2People on statins had slightly lower memory scores at the start, but didn't decline faster over 4.7 years.
- 3Those who started with low memory had higher dementia risk while on statins.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Journal of the American College of Cardiology
Year
2021
Authors
Zhen Zhou, J. Ryan, M. Ernst, S. Zoungas, Andrew M Tonkin, Robyn L. Woods, John J McNeil, Christopher M. Reid, A. Curtis, R. Wolfe, J. Wrigglesworth, Raj C. Shah, Elsdon Storey, A. Murray, S. Orchard, M. Nelson
Related Content
Claims (6)
Statins cause muscle pain, fatigue, and cognitive impairment in some people, and the type and severity of these effects differ between individuals.
In older adults without dementia, those with lower initial cognitive function who take statins have a higher risk of developing dementia than those with higher initial cognitive function who take statins.
Among adults aged 65 and older without prior dementia or heart disease, taking statins does not change the risk of developing dementia, mild cognitive impairment, or decline in memory, language, thinking speed, or other cognitive functions over nearly five years.
In adults aged 65 and older, taking hydrophilic statins versus lipophilic statins does not change the risk of developing dementia, mild cognitive impairment, or cognitive decline over a median follow-up of 4.7 years.
Older adults aged 65 and older who take statins have lower cognitive test scores at the start of observation compared to those who do not, but their cognitive abilities decline at the same rate over time.
In people aged 65 and older without dementia, the level of LDL cholesterol in the blood at the start of the study does not relate to whether they later develop dementia, mild cognitive impairment, or cognitive decline, whether or not they take statins.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.