Alzheimer's May Begin 7 Years Before Brain Scans Detect It
A surprising discovery suggests key warning signs may surface long before doctors can spot them.
A recent study published in Nature Neuroscience suggests that Alzheimer's disease may begin seven years before it can be detected using current brain imaging methods. Researchers found that structural changes in the brain linked to the disease can be observed on MRI scans long before amyloid plaques become visible on PET scans, which have traditionally been considered the earliest detectable sign of Alzheimer's.
The study followed cognitively healthy older adults over nearly two decades, examining MRI scans from the previous decade. The findings indicate that measurable structural changes in the brain occur years before the appearance of amyloid plaques on scans, raising questions about the definition of when the disease begins. Experts suggest that biological processes linked to Alzheimer's may be active before plaques appear, potentially contributing to plaque formation or occurring alongside very early plaque-related changes that are currently invisible to imaging techniques.
This research could expand the search for new treatment targets beyond amyloid plaques and broaden the understanding of when intervention may be possible.
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