29/10/2025
The Relationship Between Scent Exposure and Brain Health
Olfaction fulfils important roles beyond the appreciation of pleasant smells. Recent research has identified loss of smell as a potential early indicator for more than 139 medical conditions, including dementia, Parkinson's disease, and certain cardiovascular and metabolic disorders.
Evidence indicates that regular activation of the olfactory sense may support improvements in memory, concentration, cognitive function, and could potentially slow age-related cognitive decline. Notably, one study demonstrated that diffusing essential oils nightly for two hours resulted in a 226% enhancement in cognitive performance. This intervention involved alternating seven essential oils—rose, orange, eucalyptus, lemon, peppermint, rosemary, and lavender. MRI analyses revealed that participants who used these oils displayed improved integrity in the neural pathway connecting the memory centre to the prefrontal cortex, an area integral to decision-making.
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