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Smell Loss: Early Alzheimer's Red Flag?
14 Apr
Summary
- Loss of smell may signal Alzheimer's years before cognitive decline.
- Brain's immune cells mistakenly attack healthy nerve fibers for smell.
- Smell tests could help flag at-risk patients for early intervention.
A recent study indicates that loss of smell may serve as an early warning sign for Alzheimer's disease, potentially years before cognitive symptoms manifest. Research from DZNE and LMU has identified that the brain's immune cells, microglia, can mistakenly attack healthy nerve fibers essential for scent.
This phenomenon is linked to abnormal neuron firing caused by Alzheimer's, which signals microglia to remove fibers connecting the brainstem to the olfactory bulb. This damage disrupts the sense of smell, making it an early deterioration feature.
Neurologists are being encouraged to more sensitively test smell in patients, especially those over 35 with a family history of cognitive conditions. Early detection through smell sensitivity could allow for timely intervention with treatments that are most effective when administered early. Lifestyle factors also remain crucial for prevention.
