Episode Details

Dr. Michael Leon on Smell Training, Memory, Sleep, Alzheimer’s Risk, and Brain Longevity 

Your sense of smell may reveal more about your brain health than you realize, and stimulating it while you sleep may improve memory, sleep quality, and cognitive function. 

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Host Dave Asprey sits down with Dr. Michael Leon, Professor Emeritus of Neurobiology and Behavior at UC Irvine and one of the world’s most cited scientists, to explore why smell may be one of the most overlooked tools for brain health and longevity. 

Dr. Leon explains why the olfactory system has unusually direct access to the brain’s memory and emotional centers, why smell often declines alongside memory after age 60, and why reduced olfactory function has been associated with Alzheimer’s disease, cognitive decline, depression, and increased all-cause mortality. They also discuss how COVID, chronic congestion, pollution, stress, and aging can impair smell without people realizing it. 

The conversation dives into olfactory enrichment, including research showing major improvements in memory when older adults were exposed to multiple scents during sleep. Dr. Leon explains why novelty matters, how nighttime scent exposure may increase deep sleep and reduce nightmares, and why olfactory stimulation is being studied in dementia, PTSD, depression, and autism. Dave also explores connections between smell, GLP-1 drugs, exercise, rapamycin, spermidine, oxytocin, hormones, mitochondrial function, and other longevity interventions. 

This is essential listening for anyone interested in memory, sleep, Alzheimer’s prevention, brain aging, smell training, dementia, PTSD, autism, longevity, neuroplasticity, biohacking, and protecting cognitive function as you age. 

You’ll Learn: 

-Why your sense of smell often declines alongside memory 

-How smell connects directly to the brain’s memory and emotional centers 

-Why poor olfactory function is associated with Alzheimer’s risk and mortality 

-How chronic congestion may affect memory and brain health 

-What COVID-related smell loss may mean for long-term cognitive health 

-How olfactory enrichment can stimulate memory centers while you sleep 

-Why one study reported a 226% improvement in memory in healthy older adults 

-How scent exposure may increase deep sleep and reduce nightmares 

-Why novelty and rotating scents appear to matter for neuroplasticity 

-How smell training is being studied in dementia, depression, PTSD, and autism 

-Why several longevity interventions are also associated with improved olfaction 

-How GLP-1 drugs may affect smell, food enjoyment, memory, and emotion 

-Why professional wine tasters may offer clues about protecting the aging brain 

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