Among 25,000+ UK Biobank participants, cannabis users displayed brain functional connectivity patterns typically seen in younger people, along with better cognitive performance.
Neuroscientists studying aging; older adults considering cannabis; brain imaging researchers.
Cannabis use reversed aging-associated brain network patterns in 25,000+ participants
What the researchers found
Cannabis use and healthy aging were associated with overlapping brain network configurations, particularly between subcortical-sensorimotor and subcortical-cerebellar regions, but with significantly reversed effects. Cannabis users showed superior cognitive performance across multiple domains and brain network characteristics typically associated with younger brains.
Why it matters
As cannabis use increases among older adults, understanding how it interacts with brain aging processes is critical. This large-scale study suggests cannabis may have modulatory effects on age-related brain changes.
The numbers in context
Over 25,000 UK Biobank participants analyzed. Cannabis use and aging showed overlapping but reversed brain network patterns. Cannabis users showed superior performance across multiple cognitive domains.
How the study worked
Analysis of 25,000+ UK Biobank participants examining relationships between cannabis use, brain functional network connectivity (FNC), normative aging, and cognitive function.
What this study cannot tell us
Cross-sectional. Self-reported cannabis use. UK Biobank healthy volunteer bias. Cannot determine whether cannabis causes differences or healthier-brained people use cannabis.
How to read the evidence
Very large sample but cross-sectional with self-reported cannabis use.
When this study was published
2025 study
The bigger picture
The finding that cannabis reverses some aging-associated brain connectivity patterns raises intriguing questions about endocannabinoid system involvement in neurodegeneration, though causation cannot be established.
Questions still open
- Does cannabis actually slow brain aging? Would longitudinal studies confirm these patterns? What specific cannabinoids drive these effects?
Common questions
Does cannabis prevent brain aging?
How large was this study?
Read the original research
Neural Signatures of Cannabis Use: Reversing Cognitive Aging via Whole-Brain Functional Network Connectivity.
Research square
Citation
Fu, Zening; Hutchison, Kent; Iraji, Armin; Sui, Jing; Calhoun, Vince. (2025). Neural Signatures of Cannabis Use: Reversing Cognitive Aging via Whole-Brain Functional Network Connectivity.. Research square. https://doi.org/10.21203/rs.3.rs-6977015/v1
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