[The Science of Spice: Exploring the Scoville Scale and the Genetics of Heat]-[Totally Spiced Out!]

Wow in the World · B1 · 2017-12-11

📋 Summary

The Science of Spice: A Deep Dive into Chili Peppers

In this episode of Wow in the World, hosts Mindy and Guy Raz take listeners on a flavorful journey to the "Super Bowl of Spice Smackdown," a high-stakes championship event where the world’s hottest peppers compete. Through this comedic exploration, they break down the fascinating science behind what makes peppers spicy and why humans react to them the way they do.

The Scoville Heat Scale: Measuring the Burn

Central to the discussion is the Scoville Heat Scale, a tool invented by American pharmacist Wilbur Scoville. The hosts explain that the heat in peppers comes from capsaicin, a "colorless, odorless... oil-like chemical compound."

Historically, scientists measured this heat through a process of diluting the capsaicin with sugar water until a panel of professional taste testers could no longer detect the spice. The more sugar water required to "snuff out the heat," the higher the pepper’s rating on the scale. For instance, a sweet pepper registers at a "big fat zero," while a jalapeno pepper typically ranges between 2,500 and 8,000 Scoville heat units (SHU). In contrast, extreme peppers like the Carolina Reaper can reach a staggering 2.2 million SHU, and the recently developed Pepper X clocks in at an intense 3.1 million SHU.

Botanical Classification: Fruits in Disguise

One of the surprising revelations in the episode is that peppers are botanically classified as fruits. Mindy points out that while many people categorize them as vegetables, peppers—along with tomatoes, eggplants, and cucumbers—qualify as fruits because they contain seeds and originate from flowering plants. This challenges the common perception that all fruits must be sweet rather than spicy.

The Genetics and Tolerance of Spice

Why do some people crave spicy food while others find it unbearable? The hosts explore the biological mechanisms behind this, noting that our mouths and throats contain "tiny capsaicin-detecting spice detectors." These receptors send signals to our brains, creating the "tingly burning sensation" we associate with heat.

Research from the University of Helsinki regarding twins suggests that genes play a significant role in our spice tolerance. However, the hosts also emphasize that environmental factors and cultural habits are equally important. People raised in regions like India or Mexico, where spicy foods are a staple, often develop a higher tolerance over time, demonstrating that our ability to handle heat is not solely predetermined by our DNA.

Conclusion: A Spicy Future

The episode concludes with a dramatic showdown between the legendary "Grandma G-Force" and the reigning champion, Peter Piper, highlighting that while genetics provide a baseline, our relationship with food is dynamic. Whether you prefer your wings "mild, medium, or hot," the science of spice remains a vibrant area of human curiosity, connecting our biology to the global culinary traditions that define our world.

🎯Key Sentences

I think it's squeezing my Oh, that's okay.

It'll bounce back.

On second thought, why don't we just hang out here

Hold on to your hot tamales

Oh, well, that's kind of sad, I guess.

Expand All

📝Key Phrases

music to your ears

a November to remember

get on with the show

try this baby on for size

on second thought

Expand All

📖 Transcript

Grownups, Wondery Plus subscribers can listen to Wow in the World early and ad-free right now.

Join Wondery Plus in the Wondery app or Wondery Kids Plus on Apple Podcasts.

Hey, Wowzer fans, Mindy here.

And before we start the show, I gotta let you know that this November, with a special new episode featuring our friends at Circle Round and Terrestrials on Radiolab for Kids,

And don't miss when Elmo from Sesame Street stops by Wow in the World to make us all belly laugh on November 24th.

Oh, but that's not all, Reg.

Or study on the web version →