Researchers have increasingly warned that excess weight may influence long-term brain health, not just cardiovascular risk.
As dementia rates continue to rise globally, scientists are turning to blood-based tools that can reveal early neurological changes long before symptoms appear.
An U.S. study, reported by Euronews, examining whether obesity accelerates Alzheimer-related processes.
Emerging biomarkers and why they matter
According to Euronews, the Washington University School of Medicine team followed 407 adults over five years, comparing PET scans with blood tests that measured markers such as pTau217 and neurofilament light chain (NfL).
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These indicators are gaining attention because they can be collected easily and may detect disease activity earlier than imaging.
Researchers stress, however, that biomarkers alone cannot diagnose Alzheimer’s and must be interpreted with caution.
What the study observed
Euronews reports that participants with obesity showed faster increases in NfL and sharper rises in pTau217 than those without obesity. Amyloid also accumulated more rapidly.
Dr. Cyrus Raji, one of the study’s authors, told the outlet that these patterns could help map out the earliest stages of Alzheimer’s more accurately.
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He added that, in this study, blood tests identified biological changes sooner than PET scans typically would.
A broader public-health context
Although the authors describe the project as preliminary, the findings echo earlier research linking metabolic health to cognitive decline.
The World Health Organization estimates that about 57 million people worldwide live with dementia, most of them with Alzheimer’s disease.
As less invasive tools become more common, scientists hope they will improve risk assessment and guide earlier interventions, even as questions about reliability and access remain.
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Sources: Euronews, and The World Health Organization.
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