A new study published by the Alzheimer's Association suggests your blood's 'biological age' could significantly predict your risk of developing dementia. Researchers from King's College London analyzed UK Biobank data from over 223,000 participants, focusing on blood metabolites-small molecules linked to fat processing, inflammation, and energy use.
They calculated a measure called MileAge delta: the difference between an individual's metabolite-predicted age and their actual age. A higher delta means your blood profile looks older than you are. Nearly 4,000 participants developed dementia during follow-up.
The results were striking: those with both a higher MileAge delta and the APOE gene-linked to Alzheimer's-had a 10-times greater risk of all-cause dementia. The strongest association was for vascular dementia, the second most common form.
Study co-author Dr. Julian Mutz noted that unlike genetic risk, biological aging measured through metabolites is modifiable through lifestyle or clinical intervention. Managing cardiovascular risk factors, staying physically active, and monitoring mental health can help slow biological aging.
Mutz emphasized: 'Dementia is not an inevitable consequence of aging. It can potentially be delayed or prevented.' Because the study was observational, it could not prove causation, and the biomarker still requires further validation before clinical use.