Why Does Mint Make Your Mouth Feel Cold?

iStock/bhofack2
iStock/bhofack2

Reader Lisa from Anderson, California, wrote in with a question: "Chew a piece of mint gum and then drink something. It seems colder. Why is that?"

Mint gum or candy might make everything in your mouth feel sub-zero, but like the hot water that sometimes feels cold I wrote about in 2008, the feeling is just a thermal illusion that happens when our sensory receptors get fooled by stimuli.

At the heart of the minty matter is a protein called the transient receptor potential cation channel subfamily M member 8 (TRPM8), which is expressed in sensory neurons. TRPM8 is an ion channel, a type of protein that regulates the movement of ions across the membranes of cells. Just like only certain keys can open a lock on a door, only certain stimulants can open the ion channel and access the cell. TRPM8 opens in the presence of cold temperatures and allows Na+ and Ca2+ ions to enter the cell. This changes the electrical charge within the neuron and the information being sent from the neuron to the central nervous system, eventually leading to the perception of cold.

TRPM8 doesn't just respond to cold temperatures, though.

It also activates in the presence of menthol, a waxy, crystalline organic compound found in peppermint and other mint oils. (It responds to other "cooling agents," too, like eucalyptol and icilin. Why, exactly, is unknown; menthol just happens to fit the cellular "lock.") In the presence of menthol, TRPM8 ion channels open up the same way they would if the ambient temperature in your mouth dropped. The same "hey it's cold in here!" signal is sent to the brain, even though menthol doesn't actually cause the temperature in the mouth to change. And just like that, the wondrous human brain is tricked by a piece of Doublemint.

Even after you spit the gum out, a little menthol will remain and the sensory neurons will stay sensitized. Drinking anything cold or even taking in a big breath of cool air will cause the neurons to fire again, and the double whammy of the cool temperature and the menthol will make your mouth seem extra cold. Even a hot drink will seem weirdly cool and refreshing.

TRP-V1, another ion channel on the sensory neurons, displays a similar quirk. TRP-V1 is activated by hotter temperature, but also responds to capsaicin, the chemical responsible for the spiciness of hot peppers. This can cause even ice cold drinks to feel hot.

So what would happen if you ate a chili pepper that's been in the freezer, or a warmed up mint? Or ate a hot pepper and a cool mint at the same time? Would the hot and cold perceptions cancel each other out? To be honest, we're not sure. Has anyone ever tried this at home?

10 Frank Facts About the Wienermobile

Business Wire
Business Wire

This year marks the 83rd anniversary of the Oscar Mayer Wienermobile, that effortlessly charming, street-legal marketing tool on wheels. The next time you’re in the vicinity of one—a fleet of six makes up to 1400 stops annually—take the time to reflect on the past, present, and future of history’s most famous locomoting hot dog.

1. The Wienermobile started as a kind of land sub. 


Oscar Mayer

In 1936, Carl Mayer, nephew of hot dog scion Oscar Mayer, suggested a marketing idea to his uncle: build a 13-foot-long mobile hot dog and cruise around the Chicago area handing out his “German wieners” to stunned pedestrians. Crafted from a metal chassis, the vehicle was operated by Carl, who could usually be seen with his torso sticking out from the cockpit.

2. The Wienermobile was once driven by "Little Oscar."

Throughout the 1930s, ‘40s, and ‘50s, Oscar Mayer enlisted various little people to portray “Little Oscar,” a company mascot sporting a chef’s hat. Little Oscar soon assumed piloting duties for the Wienermobile, waving to crowds and dispensing wiener whistles that kids could use to alert other children to the presence of the car in their neighborhood. Performer George Malchan portrayed the character from 1951 to 1987.

3. The Wienermobile disappeared for decades.

While novelty automobiles were all the rage circa World War II, Oscar Mayer saw interest wane in the 1960s and 1970s, as kitsch gave way to more contemporary advertising campaigns. But when the company put a Wiener back on the road for its 50th anniversary in 1986, they discovered a whole generation of consumers who were nostalgic for the car. The company ordered six new models in 1988.

4. Wienermobile drivers train at Hot Dog High.

Since resurrecting the marketing campaign, Oscar Mayer has trained aspiring Wienermobile drivers at Hot Dog High in Madison, Wisconsin. The company receives 1000 to 1500 applications for the 12 available positions annually, typically from college graduates looking for a road trip experience. Those selected for duty are given 40 hours of instruction and assigned a different region of the country. The company tracks their routes with a GPS.

5. Wienermobile passengers ride "shotbun."

Oscar Mayer Wienermobile
Tim Boyle/Getty Images

Wienermobile motorists—a.k.a. Hotdoggers—typically ride in pairs, with the driver keeping an eye on the road and the passenger acknowledging and waving to passersby who want to interact with the vehicle. This is known as riding “shotbun,” and the greetings are mandatory. Some occupants have reported that even after going off-duty, they’ll keep waving to other drivers out of habit.

6. The Wienermobile interior is just as delicious.

Wienermobile fans who are invited to board—and promise to fasten their “meat belts” before rolling—are treated to a rare peek inside the vehicle’s interior. Ketchup- and mustard-colored upholstery surround the six seats, with condiment "stains" dotting the floor; for parades, occupants can wave from the “bunroof.” Two accent hot dogs are parked on the dashboard.

7. The Wienermobile once crashed into a house.

Though it can be challenging to pilot an enormous hot dog, most Wienermobiles log mileage without incident. A rare exception: a 2009 accident near Milwaukee, Wisconsin, when a driver attempted to back the vehicle out of a residential driveway, thought she was in reverse, but shot forward and bored into an unoccupied home.

8. Al Unser Jr. drove the Wienermobile for laps at the Indy 500.

While one might expect the Wienermobile to have the handling of a tube-shaped camper, some models were surprisingly nimble. Race car driver Al Unser Jr. took to the Indianapolis Motor Speedway in 1988 and drove it for laps. The dog reached an impressive 110 miles per hour.

9. There's a version of the Wienermobile called a "Wienie-Bago."

Oscar Mayer Wienermobile WIENIE-BAGO
Oscar Mayer

Super Bowl attendees who couldn’t snag a hotel room in San Francisco for the 2016 showdown between the Carolina Panthers and Denver Broncos had a pork-based solution: Oscar Mayer auctioned off two nights in their Wienie-Bago, an RV that sleeps four. Missed it? If you're in Chicago, you can rent a Wienermobile that sleeps two for $136 a night. A bed, outdoor dining area, and a fridge stocked with hot dogs are all included.

10. You can buy a miniature Wienermobile.

For the 2015 gift-giving season, Oscar Mayer issued a limited-edition, remote-controlled version of the Wienermobile. The 22.5-inch-long mini-dog sent collectors scrambling on Cyber Monday, when the company released just 20 for purchase at a time. The Rover is able to hold two hot dogs for transport across picnic tables. You can still find them on eBay.

Autumnal Dessert Spices and Cubed Meat Collide: Pumpkin Spice SPAM Now Exists

David McNew/Getty Images
David McNew/Getty Images

Does sipping on a pumpkin spice latte ever make you think: “Man, I wish this were cubed meat”? Soon, it will be. According to NBC News, Hormel will start selling Pumpkin Spice SPAM on September 23.

It all started back in October of 2017, when Hormel announced via its Facebook page that pumpkin spice SPAM was coming—as a joke. The post clearly stated that it wasn’t real, but that didn’t stop scores of people from making comments about how it would probably taste delicious and asking where they could purchase a can.

Now, a Hormel publicist has confirmed to NBC News that the limited-edition, fall-themed flavor will soon be available to order online from Walmart or Spam.com.

"True to the brand’s roots, SPAM Pumpkin Spice combines deliciousness with creativity, allowing the latest variety to be incorporated into a number of dishes, from on-trend brunch recipes to an easy, pick-me-up snack,” Hormel told NBC News.

While Pumpkin Spice SPAM might not yet be accepted into pumpkin spice canon alongside lattes and muffins, it’s far from the strangest product that has been imbued with the mysterious, cinnamon-y spice blend to date; we’ll leave automotive exhaust spray and light bulbs to duke it out for that designation. And the Facebook commenters might have actually been onto something when they dared to suggest that Pumpkin Spice SPAM had palatal potential. After all, ham recipes often include sweet ingredients like maple syrup, brown sugar, and honey. And, according to TIME, the word spam was invented as a portmanteau of spiced ham.

Wondering what other SPAM innovations you might be missing out on? Check out these recipes from around the world.

[h/t NBC News]

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