Overview
- A large UK Biobank study of 223,496 adults found that people whose biological age exceeded their calendar age, estimated from blood metabolites, faced higher dementia risk and developed it earlier.
- Those with a metabolomic age more than one standard deviation above average had about a 20% higher hazard for all-cause dementia and a 60% higher hazard for vascular dementia.
- Risk rose further when biology and genetics combined, with participants carrying two APOE ε4 variants plus high metabolomic age showing roughly a tenfold hazard for all-cause dementia.
- The signal was strongest for vascular dementia, and the study did not find a statistically significant link with incident Alzheimer’s disease.
- Lipids, lipoproteins, and amino acids shaped the age measure, with glycoprotein acetyls and glucose–lactate tied to higher hazards and branched-chain amino acids tied to lower risk in some subtypes, though authors note the observational design, single metabolomics timepoint, and diagnosis from routine records require independent replication before clinical use or trial-enrichment.