The Science Behind Why We Crave Loud and Crunchy Foods

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A number of years ago, food giant Unilever polled consumers asking how the company might improve their popular line of Magnum ice cream bars. The problem, respondents said, was that the chocolate coating of the bars tended to fall off too quickly, creating blotches of sticky goo on carpeting. Unilever reacted by changing the recipe to make the chocolate less prone to spills.

When they tested the new and improved product, they expected a warm reception. Instead, they got more complaints than before. While the updated bar didn’t make a mess, it also didn’t make the distinctive crackle that its fans had grown accustomed to. Deprived of hearing the coating collapse and crumble, the experience of eating the ice cream was fundamentally changed. And not for the better.

Smell and taste researcher Alan Hirsch, M.D. refers to it as the “music of mastication,” an auditory accompaniment to the sensory stimulus of eating. “For non-gustatory, non-olfactory stimulation, people prefer crunchiness,” he tells Mental Floss. Humans love crunchy, noisy snacks, that loud rattling that travels to our inner ear via air and bone conduction and helps us identify what it is we’re consuming. Depending on the snack, the noise can reach 63 decibels. (Normal conversations are around 60 dB; rustling leaves, 20 dB.)

When we hear it, we eat more. When we don’t—as in the case of Magnum bars, or a soggy, muted potato chip—we resort to other senses, looking at our food with doubt or sniffing it for signs of expiration. Psychologically, our lust for crispy sustenance is baked in. But why is it so satisfying to create a cacophony of crunch? And if we love it so much, why do some of us actually grow agitated and even aggressive when we hear someone loudly chomping away? It turns out there’s a lot more to eating with our ears than you might have heard.

 
 

The science of crunch has long intrigued Charles Spence, Ph.D., a gastrophysicist and professor of experimental psychology and head of the Crossmodal Research Laboratory at the University of Oxford. Food companies have enlisted him and consulted his research across the spectrum of ingestion, from packaging to shapes to the sound chips make rustling around in grocery carts.

“We’re not born liking noisy foods,” he tells Mental Floss. “Noise doesn’t give a benefit in terms of nutrition. But we don’t like soggy crisps even if they taste the same. Missing the sound is important.”

In 2003, Spence decided to investigate the sonic appeal of chips in a formal setting. To keep a semblance of control, he selected Pringles, which are baked uniformly—a single Pringle doesn't offer any significant difference in size, thickness, or crunch from another. He asked 20 research subjects to bite into 180 Pringles (about two cans) while seated in a soundproof booth in front of a microphone. The sound of their crunching was looped back into a pair of headphones.

After consuming the cans, they were asked if they perceived any difference in freshness or crispness from one Pringle to another. What they didn’t know was that Spence had been playing with the feedback in their headphones, raising or lowering the volume of their noisy crunching [PDF]. At loud volumes, the chips were reported to be fresher; chips ingested while listening at low volume were thought to have been sitting out longer and seemed softer. The duplicitous sounds resulted in a radical difference in chip perception. It may have been a small study, but in the virtually non-existent field of sonic chip research, it was groundbreaking.

A view inside a potato chip bag
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For Spence, the results speak to what he considers the inherent appeal of crunchy foods. “Noisy foods correlate with freshness,” he says. “The fresher the produce, like apples, celery, or lettuce, the more vitamins and nutrients it’s retained. It’s telling us what’s in the food.”

Naturally, this signal becomes slightly misguided when it reinforces the quality of a potato chip, a processed slab of empty calories. But Spence has a theory on this, too: “The brain likes fat in food, but it’s not so good at detecting it through our mouths. Noisy foods are certainly fattier on average.”

Fatty or fresh, raising decibels while eating may also have roots in less appetizing behaviors. For our ancestors who ate insects, the crunch of a hard-bodied cricket symbolized nourishment. In a primal way, violently mincing food with our teeth could also be a way to vent and dilute aggression. “There are some psychoanalytic theories related to crunchiness and aggressive behavior,” Hirsch says. “When you bite into ice or potato chips, you’re sublimating that in a healthy way.”

 
 

All of these factors explain why crunch appeals to us. But is it actually affecting what we taste?

Yes—but maybe not the way you’d think. “Sound affects the experience of food,” Spence says. “The noise draws attention to the mouth in the way something silent does not. If you’re eating pâté, your attention can drift elsewhere, to a television or to a dining companion. But a crunch will draw your attention to what you’re eating, making you concentrate on it. Noisy foods make you think about them.”

That crunch can also influence how much food we consume. Because noisy foods tend to be fatty, Spence says, they’ll retain their flavor longer. And because the noise reinforces our idea of what we’re eating, it affords us a sense of security that allows us to keep consuming without having to look at our snack—not so important in a brightly-lit room, but crucial if we’re in a dark movie theater. “It becomes more important when you can’t see what you’re eating,” Spence says.

Thanks to this hard-wired feedback, the snack industry has made it a priority to emphasize the sounds of their foods in both development and marketing. In the 1980s, Frito-Lay funded extensive work at a Dallas plant that involved $40,000 chewing simulators. There, they discovered the ideal breaking point for a chip was four pounds per square inch (PSI), just a fraction of what we might need to tear into a steak (150 to 200 PSI). The quality and consistency of the potatoes themselves is also key, according to Herbert Stone, Ph.D., a food scientist who has worked with companies on product development. “Too thick, too hard, and people don’t like them,” Stone tells Mental Floss. “Too thin and they just crumble.”

The right potato sliced at the right thickness with the right oil at the right temperature results in a solid chip—one resilient enough to make for a satisfying break when it hits your molars, but vanishing so quickly that your brain and body haven’t even processed the calories you’ve just taken in. “If they pick it up and put it in the mouth and the crunch is not what they expect, they might put it down,” Stone says. “It’s about expectation.”

A shopper examines a bag of potato chips
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Walk down the snack aisle in your local supermarket or glance at commercials and you’ll find no shortage of claims about products being the boldest, crunchiest chip available. For years, Frito-Lay marketed Cheetos as “the cheese that goes crunch!” Even cereals try to capitalize on the fervor, making mascots—Snap, Crackle, and Pop—out of the sound their Rice Krispies make when submerged in milk. One ad for a brand of crisps drew attention for “cracking” the viewer’s television screen.

For most consumers, the promise of sonic flavor will draw their attention. But for a small number of people diagnosed with a condition dubbed misophonia, the sound of a co-worker or partner crunching on chips isn’t at all pleasurable. It’s insufferable.

 
 

According to Connecticut audiologist Natan Bauman, M.D., the average noise level of someone masticating a potato chip is between 25 to 35 decibels. (Other sources peg it as closer to 63 dB when you're chewing on a chip with your mouth open, or 55 dB with your lips closed.) When you hear your own chewing, the sound is being conducted both via the air and your own bones, giving it a distinctively unique sound. (Like talking, hearing yourself chewing on a recording might be troubling.)

For someone suffering from misophonia, or the literal hatred of specific sounds, it's not their own chomping that's the problem. It's everyone else's.

When we chew, Bauman says, the auditory cortical and limbic system areas of our brain are lighting up, getting information about freshness and texture. But people with misophonia aren’t struggling with their own sounds. Instead, they're affected by others typing, clicking pens, or, more often, chewing. The sound of someone snacking is routed from the cochlea, or cavity in the inner ear, and becomes an electric signal that winds up in the brain’s amygdala, which processes fear and pleasure. That's true for everyone, but in misophonics, it lands with a thud. They’ve likely developed a trigger, or negative association, with the sounds stemming from an incident in childhood.

“If you are scolded by a parent and they happen to be eating, or smacking, it becomes negative reinforcement,” Bauman says. Chewing, lip smacking, and even breathing become intolerable for sufferers, who often feel agitated and nervous, with corresponding increases in heart rate. Some fly into a rage.

Misophonics don’t necessarily recoil at all of these sounds all of the time: It may depend on who’s doing the snacking. Often, it’s a co-worker, spouse, or family member munching away that prompts a response. Fearing they’ll damage that relationship, sufferers tend to vent online. The misophonia subreddit is home to threads with titles like “And the popcorn eater sits RIGHT next to me on the plane” and “Chips can go f-ck themselves.” (The entire content of the latter: “F-ck chips, man. That is all.”)

Bauman says misophonia can be treated using cognitive therapy. An earpiece can provide white noise to reduce trigger sounds while sufferers try to retrain their brain to tolerate the noises. But even the sight of a bag of chips can be enough to send them scrambling.

People with misophonia might also want to exercise caution when traveling. Although some Asian cultures minimize crunchy snacks because loud snacking is considered impolite, other parts of the world can produce noisier mealtimes. “In parts of Asia, you show appreciation for food by slurping,” Spence says. Slurping is even associated with a more intense flavor experience, particularly when it’s in the setting of a comparatively quiet dining establishment.

Western culture favors noisier restaurants, and there’s a good reason for that. Supposedly Hard Rock Café has mastered the art of playing loud and fast music, resulting in patrons who talked less, ate faster, and left more quickly, allowing operators to turn over tables more times in an evening.

Spence believes sound will continue to be important to gastronomy, to chefs, and to food companies looking to sell consumers on a complete experience. Snack shelves are now full of air-puffed offerings like 3-D Doritos and Pop Chips that create pillows of taste. With less volume, you’ll snack more and crunch for longer periods.

A woman snacks on a chip
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But the sound of the chip is just one part of the equation. The way a bag feels when you pick it up at the store, the aroma that wafts out when you first open the bag, the concentration of flavor from the granules of seasoning on your fingers—it’s all very carefully conducted to appeal to our preferences.

“When we hear the rattle of crisps, it may encourage people to start salivating, like Pavlov’s dogs,” Spence says, referring to the Russian scientist who trained his canines to salivate when he made a certain sound. We’re conditioned to anticipate the flavor and enjoyment of chips as soon as we pick up a package. Even hearing or saying the words crispy and crunchy can prime us for the experience.

When we’re deprived of that auditory cue, we can get annoyed. After news reports emerged that Pepsi CEO Indra Nooyi had mentioned her company might consider a quieter version of Doritos for women—an idea PepsiCo later denied they would label in a gender-specific fashion—women Doritos enthusiasts rallied around the Texas state capitol, condemning the perceived gender discrimination. To protest the possible dilution of their favorite snack, they made a spectacle of crunching Doritos as loudly as they could.

11 Secrets of Restaurant Servers

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If you enjoy eating at restaurants, it's worth getting to know the waitstaff. Servers are the face of the establishments where they work, and often the last people to handle your food before it reaches your table.

"People think it’s an easy job, and it’s really not," Alexis, a server who’s worked in the business for 30 years, tells Mental Floss. She says, jokingly, "You want a professional handling your food, because we have your life in our hands."

Even if they don't spit on your plate (which thankfully they almost never will), a waiter can shape your dining experience. We spoke with some seasoned professionals about how they deal with rude customers, what they wish more customers would do, and other secrets of the job.

1. Server pay varies greatly.

The minimum wage changes from state to state, but for tipped workers like servers, the difference in pay can be even more drastic depending on where you work. In over a dozen states, if a worker typically makes a certain amount per month in tips (often $20-$30), their employers are only required to pay them a minimum of $2.13 an hour. That’s how much Jeff, a video producer who’s held various jobs in the restaurant industry, made when serving tables in New Jersey. “Usually, if I had a full paycheck of serving I could just put a little bit of gas into the tank,” he tells Mental Floss.

Waiters and waitresses in many states rely almost entirely on tips to make a living—but that’s not the case everywhere. California, Oregon, and Washington each pay tipped employees minimum hourly wages over $10. Jon, who currently works at a casual fine dining restaurant in Portland, Oregon, gets $12 an hour from his employer. Including tips, he typically earns $230 a day before taxes, and brings home about $34,000 a year on a 25-hour work week.

2. They split up tips among the restaurant staff.

Here’s another reason to be generous with your tips: Whatever extra money you leave on the table may be going to more than one person. If you ordered a drink from the bar, or if there was anyone other than your server bringing your food and clearing it from the table, that tip will likely be split up. At one restaurant job, Jeff says he paid food expeditors (workers who run food from the kitchen to tables) 10 percent of whatever tips he earned.

3. Waiters and waitresses know how to handle rude customers.

In addition to taking orders and serving food, servers are often forced to de-escalate conflicts. For many people waiting tables, this means acting sweet and professional no matter how angry customers get. Jon’s strategy is to “treat them like a child, smile, tell them everything they want to hear and remind yourself that it’ll be over soon.” Similarly, Mike (not his real name), a server at a farm-to-table restaurant in Texas, likes to “kill them with kindness." He tells Mental Floss he tries to “be the bigger man and [not] return sour attitudes back to people who don’t treat me with respect. If nothing else I can hold my head high knowing I did my job to the best of my ability and didn’t let their negativity affect my day with other, more pleasant patrons.”

Alexis, who currently waits tables at a family-owned restaurant in California, goes beyond faking a smile and makes a point to practice empathy when serving rude guests. “There’s a hospital near my restaurant, and people come there for comfort food with hospital visitor stickers on their clothes all the time. And I know then that they’re going through something traumatic usually. So when people are acting badly, I put imaginary hospital stickers on their clothes and try to remove my ego.”

4. Your waiter (probably) won’t spit in your food.

While most servers have had to deal with a customer who treats them poorly, they rarely retaliate. On the old urban legend of servers spitting in their customer’s food, Alexis says, “Never seen anybody mess with anybody’s food out of spite or malicious intent. I’ve never seen it happen and I’ve never actually done it. I don’t need to get back at people like that.”

5. Servers do more than wait tables.

Most customers just see one aspect of a server's jobs. When they’re not refilling your drinks and bringing you condiments, they're doing side work—either before the restaurant opens, after the last guest leaves, or in between waiting tables. “It could be rolling silverware, filling sauces, cutting lemons, rotating salad bars, stuff like that,” Jeff says. “It’s not just serving and you leave; there’s usually something else behind the scenes that the server has to do.”

Alexis says that in addition to hosting and serving, she has to prep to-go orders, bus tables, and wash dishes. "We’re expected to be working every moment,” she says.

6. Waiters have some wild stories.

Though parts of the job are tedious, servers are bound to see interesting things. Alexis recalls a husband and wife who were regulars at the restaurant where she worked in the 1990s; the man was later arrested for murder. “I found out when a newspaper reporter started asking me questions about them,” she says. “I’m quoted on the front page of the LA Times as saying ‘A waitress in a local coffee shop said they were a nightmare!’”

Other stories are lighter. “When I worked at Red Robin there was a lady that came in every morning and would ask to sit in the same booth," Jon says. "She carried a bag [of] stuffed animals (mostly dragons) and situated them around the booth, always in the same spots, she’d talk to them throughout her dining experience.”

7. Waiters hate it when you don't know what you want.

The simplest way to get on your server’s good side is to know exactly what you want when you tell them you're ready to order. That means not wasting their time stalling as you speed-read the menu. If you haven't decided on a dish, let your server know and trust that they'll return to your table in a few minutes. “Don’t tell your server you’re ready to order if you’re not ready to order,” Alexis says. “I’m like ‘Come on, I know you’re not ready. I’m going someplace else and I’ll be back.’”

It also means not asking your server to make several trips to your table in the span of a few minutes. Mike says that customers asking for items one at a time is one of his biggest pet peeves. “[Customers will say] ‘I need salt. I need hot sauce. I need another [...] drink.’ I was away from the table for 30 seconds each time. Those requests could easily be fulfilled in one trip to the kitchen.”

8. Waiters hate when you ask to move tables.

Next time you get seated in a restaurant, think twice before asking your server to switch tables. Restaurants divide their floor plan into sections, and each server is responsible for a different group of tables. The hosts in charge of seating rotate these sections to distribute guests evenly to servers; by asking to move, you may be depriving one server of an hour’s worth of tips while creating extra work for a server who’s already swamped. According Jon, the worst time to complain about where you were seated is when a restaurant is busy: “Sometimes this isn’t a problem if we’re slow, but if it’s a Friday/Saturday chances are you were put there for a reason.”

9. Servers work when everyone else gets the day off.

Servers have to be prepared to work a different schedule every week, work late into the night, and work on weekends. This can make maintaining a normal social life challenging. “My schedule can be troublesome, my girlfriend/friends have the opposite schedule as me so I’m never able to make it out on weekends or holidays,” Jon says.

And on the days many 9-to-5 workers go out to celebrate, servers have to wait on them. “Where I currently work I have worked Christmas Eve, Christmas, New Years Eve, New Years Day, and I will have to work on Mardi Gras (in the South),” Mike says. “I was leaving for work as my family arrived at my house for Christmas. I missed a New Years party in my house. If I hadn’t requested if off as soon as I began working there I’m almost certain I’d have to work 15 [hours] on my birthday.”

10. Your server might give you a free drink if you order it at the right time.

Asking your server for a free stuff likely won’t get you anywhere, but there is one thing you can do to possibly have a drink taken off your bill. If you wait until after your meal is served to order something cheap like a soft drink, Alexis says there’s a chance you won’t get charged for it all. “Not alcoholic drinks, but I’m talking about a cup of coffee or a soda or something like that, especially if you’re already paying for other beverages,” she says. “The server might get too busy or might not be inclined to go back to the POS [point of sale] system and add them on to your bill. It’s more trouble than it’s worth sometimes.”

11. Waiters want you to learn their names.

There’s a reason most servers introduce themselves before taking your order: They’d much rather you use their real names than a demeaning nickname. “Don’t call me sweetheart! I’m wearing a damn name tag,” Alexis says. “Sometimes I respond well, and other times no.”

And if your server doesn’t introduce themselves and isn’t wearing a name tag, Jon says it doesn’t hurt to ask. “Ask what the servers name is and refer them by name when you’re talking to them.” He says it’s “refreshing when a guest does this.”

15 Tasty Bits of Pizza Slang

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iStock.com/Radionphoto

Unless you’ve worked in a pizzeria, your pizza vocabulary is probably limited. But the crust-loving pros who are cooking up your favorite slices seem to have insider slang for everything, including whimsical terms for toppings and one-of-a-kind ways of describing regional pie styles. So if you’re looking up your pizza-talk game with words that go beyond ‘za, here’s a quick list of 15 terms you should know.

1. Tip sag

The dreaded tip sag is what you get when the pointy end of your pizza starts to droop. This most often occurs with top-heavy (and topping-heavy) pies, like Neapolitan-style pizzas with generous helpings of fresh mozzarella piled on top.

2. Avalanche

An avalanche is what occurs when all the toppings slide off your pizza as soon as you pick it up. This tends to happen when a pizza is still piping hot from the oven, so be smart and give it a minute to cool down.

3. Apizza

If you ever travel to New Haven, Connecticut, you might hear the locals order apizza (pronounced uh-BEETS). This refers to the local style of thin-crust pizza, which originated at the famous Frank Pepe Pizzeria Napoletana and has since become the area's pizza standard.

4. Grandma pie

This style of pizza is thick like a Sicilian pie, but with a thinner, denser crust. Although it likely originated in Long Island, you can now find it in pizzerias throughout New York City (and beyond).

5. Party-cut

Man delivers several pizzas to a customer
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Also known as a tavern-cut, a party-cut describes any circular pizza that’s cut into a grid. The portions are smaller and typically square, which helps ensure that everyone at your Super Bowl party will get a piece of the pie.

6. All-dressed pizza

Order an all-dressed pizza in Montreal and you’ll get a deluxe pie with mushrooms, green peppers, and pepperoni on it. In Québec, it's known as a pizza tout garnie.

7. Flyers

Slices of pepperoni pizza are called flyers, reportedly because of the way they’re often tossed around like Frisbees.

8. Guppies

Depending on your perspective, guppies is either a really cute or really gross way to describe anchovies. Other slang words for the fishy topping include chovies, carp, penguin food, and smellies.

9. Alpo

It’s not very appetizing, but crumbled sausage does kind of resemble dog food—hence the Alpo moniker. Other nicknames for the topping include Kibbles ‘n Bits and Puppy Chow, neither of which make the topping sound any more appetizing.

10. Screamers

Woman preparing a mushroom pizza at home
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Mushrooms are sometimes called screamers because of the high-pitched squeal the canned variety lets out when they’re tossed onto a hot surface.

11. Edgar Allan

What does a pizza with pepperoni and onions spell out? A PO pie—which is close enough in spelling to Edgar Allan Poe's last name that it gets tossed around in pizza kitchens on occasion. Sure, P-O or Po would be easier (and quicker) to say, but it’s not nearly as fun.

12. Blood pie

Also known as a hemorrhage, this gruesome term refers to a pizza with extra tomato sauce on it. Now please forget that we ever told you that.

13. Coastline

The coastline is that little bit of exposed sauce you can see between the sauce and the crust.

14. Mutz

A margherita pizza fresh from the oven
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Mutz is simply a quicker way of saying mozzarella. Likewise, wet mutz is fresh mozzarella.

15. Roadie

When you get a slice of pizza to-go, that’s a roadie. Enjoy it while it's still hot (but not so hot as to cause an avalanche)! 

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