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The Human Upgrade · September 17, 2026 · 54m

How to Hack Your Smell for Memory and Longevity WHILE YOU SLEEEP! : 1538

Michael Leon
Show Notes

Dave Asprey talks with neurobiologist Dr. Michael Leon about the profound connection between smell and brain health. They discuss how the olfactory system has direct access to memory and emotional centers, and why decline in smell often parallels cognitive deterioration and can predict Alzheimer’s disease and mortality. The conversation covers olfactory enrichment during sleep—including a study showing a 226% memory improvement—and its potential to increase deep sleep and reduce nightmares. They also explore links between chronic congestion, COVID smell loss, GLP-1 drugs, and brain longevity.

This summary was generated from show notes and public descriptions, not from a full transcript review. Details may contain inaccuracies.

Curious

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GLP-1 Drugs May Alter Smell, Food Enjoyment, and Memory42:50
GLP-1 receptor agonists may influence olfactory function, potentially changing how people experience food and even affecting memory and emotion.
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Novel

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Olfactory Enrichment During Sleep Boosts Memory06:52
Exposure to multiple novel scents during sleep led to a 226% improvement in memory function in healthy older adults.
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Highlights

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Smell Loss as a Predictor of Alzheimer’s and Mortality15:46
Declining ability to identify smells is associated with elevated Alzheimer’s disease risk, cognitive decline, and even increased all-cause mortality.
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Nighttime Scent Exposure Increases Deep Sleep and Reduces Nightmares45:55
Rotating scents during sleep may enhance deep-sleep quality and decrease the frequency of nightmares, particularly in people with PTSD.
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Chronic Congestion Harms Brain Health via Olfactory Impairment06:52
Persistent nasal congestion, whether from allergies, pollution, or infection, can damage the olfactory system and contribute to cognitive issues over time.
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