Smell, more than taste, determines most of what we perceive as flavor

Roach explains that the tongue's taste buds detect only a handful of basic sensations, sweet, salty, sour, bitter, and umami, while the vast majority of what people experience as complex flavor actually comes from the sense of smell, specifically aromas reaching the olfactory receptors through the back of the throat while chewing. This retronasal smell pathway does most of the work that people mistakenly credit entirely to taste.

She illustrates this through simple demonstrations, including how holding the nose while eating dramatically flattens flavor perception, and through research on how congestion or smell loss during illness makes food seem bland even though taste buds remain fully functional.

Roach uses this finding to reframe common assumptions about flavor, showing that culinary experts and food scientists spend enormous effort manipulating aroma precisely because it does so much of the perceptual heavy lifting that consumers wrongly attribute to taste alone.

Takeaway: most of what you call flavor is actually smell, detected through the back of your throat as you chew.