
The study involved 865 participants' smell detection and identification abilities every five years, also assessing memory and cognition. Carriers of the APOE e4 gene variant were 37% less likely to have good odor detection at age 65-69, and at age 75-79, they experienced reduced odor identification. Gene carriers' cognitive decline was more rapid than non-carriers. These results suggest smell testing could predict dementia risk early on.
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