How Smell, Taste & Pheromone-Like Chemicals Control You | Huberman Lab Podcast #25

Olfactory System

The olfactory system is a fascinating network that begins with sniffing, allowing volatile chemicals to enter the nose and interact with the olfactory bulb. Andrew Huberman explains that this bulb is a collection of neurons extending into the nasal mucosa, responding to various odorant compounds 1. These neurons connect to the brain, triggering innate responses like fear or desire, depending on the smell. Enhancing one's sense of smell can be achieved through simple practices like nasal breathing, which increases brain alertness and sensitivity to odors 2.

Breathing more deeply through the nose wakes up your brain and creates a heightened sensitivity of the neurons that relate to smell.

--- Andrew Huberman

Training the olfactory system can significantly improve scent detection, akin to the capabilities of scent hounds, by focusing solely on olfactory input and eliminating other senses 3.

   

Taste Perception

Taste perception involves a complex system of receptors on the tongue that detect sweet, salty, bitter, umami, and sour flavors. These receptors are crucial for identifying energy sources, electrolytes, and potential toxins 4. Andrew Huberman suggests that there might be a sixth taste receptor for fat, highlighting its importance for the nervous system and overall health 5.

The ability to sense fat here in our mouth seems to be critical.

--- Andrew Huberman

Interestingly, taste receptors are not limited to the tongue; they are also found in other body parts, including the gut and reproductive organs, indicating a broader role in physiological processes 6.

   

Pheromones

Pheromonal communication, though well-documented in animals, remains a topic of debate in humans. Andrew Huberman discusses the accessory olfactory pathway, which in animals, triggers significant behavioral changes like spontaneous miscarriage or puberty onset 7. In humans, the Coolidge effect demonstrates how pheromones can influence mating behaviors, although the exact mechanisms are still under investigation 8.

There is chemical signaling between human beings.

--- Andrew Huberman

Research suggests that chemical signaling might affect menstrual cycle timing among women living closely together, though synchronization is not always observed 9.