The Chemistry of Food & Taste | Dr. Harold McGee

Umami

The discovery of umami, a taste distinct from sweet, sour, salt, and bitter, was initially met with skepticism in the West. Harold McGee explains that the Japanese had long recognized this savory taste, which was only validated by Western scientists in the early 2000s with the discovery of a glutamate receptor 1. This taste is associated with a feeling of fullness and length, spreading beyond the mouth to create a whole-body experience 2.

The Japanese were shown to be correct. By Western standards, they always knew they were correct, but by Western standards they were proved to be correct when a receptor for glutamate was discovered in the 2000s.

--- Harold McGee

Andrew Huberman suggests that the evolutionary scarcity of protein might have linked umami to reward pathways, making it a deeply satisfying taste 2.

   

Culture

Cultural background significantly influences taste preferences, as seen in the case of cilantro. Harold McGee notes that some people perceive cilantro as soapy due to molecules similar to those found in soap, a reaction often shaped by early exposure 3. This divergence in taste is not limited to cilantro; Andrew Huberman shares an anecdote about kimchi, where cultural familiarity plays a role in acceptance 4.

Cilantro has molecules that kind of... they're also found in soaps. And so for a lot of people, depending on whether they've been acculturated to cilantro early in their lives or not, if they're only encountering it as an adult, the first thing they're going to think is, that tastes like soap.

--- Harold McGee

These examples highlight how cultural and biological factors intertwine to shape our taste experiences.

   

Taste Receptors

Taste receptors play a crucial role in determining flavor intensity and preference, with thresholds that can adapt over time. Harold McGee discusses how exposure to certain taste levels, like salt, can reset our taste thresholds, making us more or less sensitive to those flavors 5. This adaptability is evident in practices like adding salt to reduce bitterness in foods such as grapefruit and coffee 6.

You can, over time, adjust thresholds and preferences for the basic tastes.

--- Harold McGee

Andrew Huberman notes that this push-pull dynamic between flavors is a fundamental aspect of our nervous system, influencing how we perceive and enjoy different foods 6.