SouthernWorldwide.com – A person’s biological age, as determined by a blood test, may indicate their future risk of developing dementia.
New research, published by the Alzheimer’s Association, has investigated the connection between an individual’s biological age and their overall risk of all-cause dementia.
Researchers in the UK analyzed data from over 223,000 participants in the UK Biobank. They measured blood metabolites, which are small molecules involved in processes like fat processing, inflammation, and energy utilization.
During the follow-up period, nearly 4,000 of these participants were diagnosed with dementia, based on their health records.
The study introduced a metric called “MileAge delta,” calculated as the difference between the metabolite-predicted age and the individual’s actual age. A higher MileAge delta signifies that a person’s blood profile appears older than their chronological age, while a lower delta suggests it appears younger.
The findings revealed a significant association: a higher MileAge delta was linked to an increased risk of developing all-cause dementia, vascular dementia, early-onset dementia, and unspecified dementia. The strongest correlation was observed with vascular dementia.
Furthermore, individuals who had both a higher MileAge delta and carried the APOE gene, a known risk factor for Alzheimer’s disease, exhibited a tenfold greater risk of developing all-cause dementia.
Dr. Julian Mutz, a co-author of the study and research fellow at King’s College London, described this combined genetic and biological aging risk as “striking.”
He emphasized the importance of understanding risk factors beyond genetics alone.
“While tenfold is a very large increase, it reflects the combination of a powerful genetic risk factor with an indicator of biological aging,” Dr. Mutz stated.
He further elaborated, “The important point is that these two sources of risk are complementary, and unlike genetic risk, metabolomic aging (biological aging measured through metabolites) is potentially modifiable through lifestyle or clinical intervention.”
Dr. Mutz suggested that managing cardiovascular risk factors, maintaining physical activity, and monitoring mental health could play a role in slowing down biological aging, thereby reducing the risk of dementia and other age-related conditions.
“Dementia is not an inevitable consequence of aging,” Dr. Mutz pointed out. “It can potentially be delayed or prevented by modifying risk factors, including biological aging.”
Echoing the significance of the APOE gene, another doctor not involved in the study reiterated its role in provoking dementia, particularly Alzheimer’s.
The research also indicated that chronic illnesses, when combined with the APOE gene, elevate the likelihood of dementia.
“There’s a 60% increased risk of vascular dementia when poor health is combined with this gene,” it was noted. “Vascular dementia correlates with heart disease, high blood pressure, and obesity.”
The study’s authors did acknowledge certain limitations. As an observational study, it could not definitively establish that a higher biological age directly causes an increased dementia risk, but rather suggested a strong association.
The participant pool, drawn from the UK Biobank, tended to be healthier and predominantly of European descent, meaning the findings may not be fully representative of the general population. Additionally, the reliance on a single blood measurement meant the study could not track changes in biological aging over time.
The researchers also noted that lifestyle behaviors and health factors might have influenced the dementia diagnoses reported in the study.
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The study’s authors stressed that the MileAge biomarker requires further validation before it can be implemented in clinical settings.
