How Smell, Taste & Pheromones Shape Behavior | Huberman Lab Essentials

Research from Noam Sobel’s group shows that inhalation itself—independent of what you smell—increases cortical arousal and improves non-olfactory cognition. Nasal breathing during focused work enhances learning compared to mouth or mixed breathing. Practical application: maintain nasal breathing during study, reading, or computer work that doesn’t require speaking or eating to marginally but meaningfully improve attention and memory.

Olfactory neurons are continually replenished throughout life and are highly plastic. Repeated, focused sniffing of distinct odors (e.g., orange, coffee, spices) for 10–15 nasal inhales per session increases the richness and nuance of perceived smell; this also enhances parallel taste experiences. Regular exposure to varied, preferably pleasant odors acts like “exercise” for your olfactory system and supports overall brain health.

Because olfactory neurons send fibers through the cribriform plate, head trauma can shear these connections and impair smell. Recovery of olfactory function after concussion correlates with aspects of brain recovery, and studies show olfactory training can aid rehabilitation. If you’ve had a TBI, structured smell training (frequent, focused exposure to multiple odors) can be part of a broader recovery protocol, alongside medical care.

Strong odors such as ammonia-based smelling salts trigger innate fear and arousal circuits via the amygdala and can dramatically increase alertness—but they are harsh, potentially damaging to the olfactory epithelium and eyes, and are generally not advisable for routine use. Milder scents like peppermint elevate attention and arousal more safely, offering a practical tool to combat mild fatigue or enhance focus without extreme stimulation.

Sweet indicates energy (sugars), salty indicates electrolytes, umami indicates amino acids/proteins, sour often signals fermentation/spoilage, and bitter warns of potential toxins, each mapped to specific neural pathways and reflexes (e.g., gag, pucker). Evidence suggests a possible sixth receptor for fat, reflecting its importance for nervous system function. Recognizing these built-in signals can help you interpret cravings and aversions more intelligently.