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Smell Loss: A Hidden Dementia Warning?
8 Oct
Summary
- Inability to identify 4 of 5 strong smells doubled dementia risk.
- Smell loss linked to smaller grey matter in brain's olfactory/memory areas.
- Smell tests may detect early dementia signs before cognitive decline.
New research highlights a surprising early warning sign for dementia: a decline in the sense of smell. Studies indicate that individuals unable to identify at least four out of five strong odors were twice as likely to develop dementia within five years compared to those with better olfactory function.
This link is thought to stem from the brain's olfactory bulb, which is near areas affected by protein buildup in conditions like Parkinson's. The olfactory system's close connection to memory and emotion centers in the brain suggests that smell impairment can signal underlying structural changes.
Specifically, a rapid decline in smell has been correlated with smaller grey matter volume in olfactory and memory-associated brain regions. This indicates that olfactory dysfunction may precede other recognized symptoms of dementia, acting as an early indicator before significant cognitive decline occurs.
