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[The Science of Saliva: Why We Grow to Love Bitter Foods]-[WeWow on the Weekend (3/29/25)]

Wow in the World · B1 · 2025-03-29

Preschool Enlightenment
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📋 Summary

The Mystery of Bitter Tastes

In this episode of Wow in the World, hosts Mindy and Guy Raz explore the fascinating biological connection between our saliva and our taste preferences, specifically why we often dislike bitter foods like kale, Brussels sprouts, and dark chocolate as children but may grow to love them as adults. The discussion centers on a scientific study conducted by Dr. Cordelia Running at Purdue University's "spit lab" (formally the Saliva, Perception, Ingestion, and Tongues Laboratory).

The Experiment: Chocolate Milk and Adaptation

Dr. Running sought to understand if the common rejection of bitter flavors is a biological trait that can be altered. She conducted an experiment with 64 participants who were asked to consume chocolate milk with a very low sugar content (only 4% sugar) daily for one week. Initially, most participants found the cocoa-heavy drink to be "crazy bitter." However, by the end of the week, the majority reported that the drink had become much more palatable. This suggested that their ability to perceive bitterness had physically shifted over time.

The Role of Saliva and Proteins

The key to this change lies in our saliva. Mindy explains that saliva is not just for breaking down food; it contains specific "teeny tiny molecules called proteins" that influence how we perceive flavors, including bitterness. Dr. Running’s research revealed that as participants repeatedly consumed the bitter chocolate milk, their salivary glands adapted. The glands began to produce more of the specific proteins that dampen or decrease the bitter flavor. In essence, the body physically adjusted to the stimulus, effectively telling the brain that the food was not as bitter as it had first perceived.

Conclusion: Changing Our Tastes

This discovery highlights an empowering biological truth: while we might be born with a natural aversion to bitter foods—often considered the most unpleasant of the five basic tastes—we are not permanently locked into those preferences. As Guy Raz reflects, his evolution into a "Kale Crusader" was likely the result of repeated exposure during his childhood. By consistently eating bitter vegetables, his body adapted, proving that "what we eat can, over time, determine the taste." The episode concludes with a playful reminder that science is constantly happening within our own bodies, even in the way we process every bite we take.

🎯Key Sentences

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OK, here's the deal.
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That's what I thought.
3
Sorry, my mistake.
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please keep them coming.
5
I guess it was a long time ago
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📝Key Phrases

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hit the road
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short notice
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come up with
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keep the excitement rolling
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take it easy
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📖 Transcript

Psst, hey, Wowser fans!
Mindy here, and before we start the show, I've got a question for you.
Pbht, brr. Are you ready to Make it Wow?
Brr, brr, brr, brr, brr, brr.
OK, here's the deal.
My buddy Carly Q. and I are hitting the road to Make it Wow with you in the DC area.

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