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Why eating turkey really makes you sleepy
Is everyone's favorite Thanksgiving centerpiece really to blame for the post-dinner doldrums?
- Americans kill around 45 million turkeys every year in preparation for the Thanksgiving meal, only to blame our favorite centerpiece for the following food comas.
- Rumor has it our after-dinner sleepiness results from the tryptophan found in turkey.
- However, it is the meal's overall nutritional imbalance, not just the tryptophan, that make us want to leave the dishes for tomorrow. Or maybe the next day.
The turkey is one of the closest living relatives to avian dinosaurs, but recent evolutionary turns has taken it from peak predator to meek entrée. Americans kill about 45 to 46 million turkeys in preparation for Thanksgiving, and to really rub it in, our nation's leader pardons one every year as a lark.
But ignominy doesn't stop there. Through selective breeding, we've dramatically increased the size of turkeys, particularly in the breast for more of that coveted white meat. This has led to all sorts of health issues, including skeletal problems, cardiac morbidity, and reduced immune response. Thanks to those robust breasts, domestic turkeys can't mate anymore and rely on us for artificial insemination.
If that wasn't bad enough, every year after we've feasted on millions of these birds, we then blame them for making us miserably tired. We've even developed a term for it: the turkey coma, the "inevitable and unavoidable nap that occurs about 45 minutes after gorging one's self on a Thanksgiving Day turkey," as one Urban Dictionary user defined it.
But are turkeys really to blame for the turkey coma? And if so, how do they manage this posthumous revenge?
Jerry and George use a turkey's tryptophan to make Celia fall asleep in the episode "The Merv Griffin Show."
(Photo from NBCUniversal)
As any Seinfeld fan can tell you, that stuff in turkey that makes you sleepy is tryptophan. Specifically, L-tryptophan, an essential amino acid that our livers synthesize into niacin. Niacin, in turn, helps create the neurotransmitter serotonin.
Our brains and bodies use serotonin for many functions. It plays a role in appetite, emotional stability, motor skills, and cognitive processes, but it's most famous for regulating our body's sleep-wake cycles. This common knowledge serves as the basis for the belief that turkey makes you sleepy.
Thing is, a lot of foods contain tryptophan. Nuts, soy, eggs, milk, salmon, chicken, spinach, yogurt, and chocolate are all dietary sources of tryptophan, with many of them containing more tryptophan than our favorite holiday fowl.
According to My Food Data, turkey has 404 milligrams of tryptophan per 100 gram serving. But in the same serving size, pumpkin and squash seeds have 576 milligrams, soybeans have 575, and reduced fat mozzarella has 571. None of these is associated with drowsiness, and nuts are a go-to for an afternoon pick-me-up snack.
Either turkey is being unfairly maligned or something else is weighing down our eyelids after a Thanksgiving meal.
Caloric cat nap
While Seinfeld may have exaggerated the effects of tryptophan, the show did get one thing right. If you want to put your girlfriend to sleep so you can play with her antique toy collection, a calorie-laden meal of turkey, heavy gravy, and a whole box of red wine will do the trick.
Americans consume a lot of calories during a Thanksgiving meal. This isn't news but the numbers, once laid bare, can still be guilt-inducing. The Calorie Control Council estimates that the average Thanksgiving meal weighs in at 3,150 calories, but it's worth noting that their estimate uses sweet tea as a beverage benchmark and not beer, wine, or cocktails.
Dietitian Tanya Zuckerbrot told Fox News that a turkey day dinner ranges between 3,000 and 4,500 calories. Like the Calorie Control Council, her estimate does not include alcoholic drinks, but she also skipped on appetizers.
Obviously, these numbers vary depending on the food available and serving sizes. But any estimate will have one thing in common: a single meal sporting well over the USDA recommended daily caloric intake for all demographics outside of Olympian athletes.
Putting the sleep turkey myth to rest
Two male turkeys named Peas and Carrots sent by the National Turkey Federation (NTF) to the White House are seen before the upcoming annual turkey-pardoning ceremony on November 19, 2018 in Washington, DC.
(Photo by Chen Mengtong/China News Service/VCG via Getty Images)
And this is why the term "food coma" is much more apt — or, if you want to get clinical, "postprandial somnolence."
"We've known for many years that meals with an imbalance of nutrients — that are rich in either fats or carbohydrates — are associated with feeling sleepy," writes Angus Steward, senior lecturer of nutrition and dietetics at Edith Cowan University. "But this is not the case when nutrients are balanced or the meal is rich in protein."
When we start our Thanksgiving meal, our stomachs begin producing a hormone called gastrin. Gastrin kickstarts the digestive process, which reroutes blood to our stomachs to carry away the newly formed nutrients.
Part of the drowsiness is due to the volume of food you consume. It simply takes longer to digest, requiring your body to take it easy while it diverts blood from other bodily functions. But as Steward explains, it isn't just volume at work here. It's also what we eat.
Thanksgiving meals are heavy in fats and carbohydrates. Carbs release glucose into the bloodstream quickly, causing a spike in insulin production. Insulin helps the body absorb the glucose, but in doing so, it makes it easier for tryptophan to pass the blood-brain barrier. Once tryptophan is in the brain, it begins conversion to serotonin to tell your body it's time to sleep.
With your body and mind at rest, your body can get to work absorbing the massive meal.
That's the bad news if you still have a daunting pile of dishes to clean Thanksgiving evening. The good news, as the National Sleep Foundation points out, is that you can use your newfound understanding as a little bio-hack. Eating small bedtime snack that contains both carbs and tryptophan, such as peanut butter on toast, can help you ease into a restful night's sleep.
Ending the blame game
So, the myth is partially right; turkey does have a role to play. It and many other Thanksgiving favorites provide you with ample tryptophan. When combined with an overall high-calorie meal and enough stuffing to carb-load for a marathon, the result is a mid-afternoon snooze.
But the turkey is hardly the sole cause of anyone's sleepiness. If anything, we only have ourselves to blame and can stop blaming it for those decisions. And even if turkey did make us sleepy, let's face it: it has far more grievances against us than we do against it.
- Does turkey make you sleepy? - The Washington Post ›
- Why Does Turkey Make You Tired? | Mental Floss ›
- Thanksgiving Myth Busted: Eating Turkey Won't Make You Sleepy ›
- Does Turkey Make You Sleepy? - Scientific American ›
- What is in turkey that makes you sleepy? The truth about tryptophan ›
- L-Tryptophan: Does Turkey Really Make You Sleepy? ›
So much for rest in peace.
- Australian scientists found that bodies kept moving for 17 months after being pronounced dead.
- Researchers used photography capture technology in 30-minute intervals every day to capture the movement.
- This study could help better identify time of death.
We're learning more new things about death everyday. Much has been said and theorized about the great divide between life and the Great Beyond. While everyone and every culture has their own philosophies and unique ideas on the subject, we're beginning to learn a lot of new scientific facts about the deceased corporeal form.
An Australian scientist has found that human bodies move for more than a year after being pronounced dead. These findings could have implications for fields as diverse as pathology to criminology.
Dead bodies keep moving
Researcher Alyson Wilson studied and photographed the movements of corpses over a 17 month timeframe. She recently told Agence France Presse about the shocking details of her discovery.
Reportedly, she and her team focused a camera for 17 months at the Australian Facility for Taphonomic Experimental Research (AFTER), taking images of a corpse every 30 minutes during the day. For the entire 17 month duration, the corpse continually moved.
"What we found was that the arms were significantly moving, so that arms that started off down beside the body ended up out to the side of the body," Wilson said.
The researchers mostly expected some kind of movement during the very early stages of decomposition, but Wilson further explained that their continual movement completely surprised the team:
"We think the movements relate to the process of decomposition, as the body mummifies and the ligaments dry out."
During one of the studies, arms that had been next to the body eventually ended up akimbo on their side.
The team's subject was one of the bodies stored at the "body farm," which sits on the outskirts of Sydney. (Wilson took a flight every month to check in on the cadaver.)Her findings were recently published in the journal, Forensic Science International: Synergy.
Implications of the study
The researchers believe that understanding these after death movements and decomposition rate could help better estimate the time of death. Police for example could benefit from this as they'd be able to give a timeframe to missing persons and link that up with an unidentified corpse. According to the team:
"Understanding decomposition rates for a human donor in the Australian environment is important for police, forensic anthropologists, and pathologists for the estimation of PMI to assist with the identification of unknown victims, as well as the investigation of criminal activity."
While scientists haven't found any evidence of necromancy. . . the discovery remains a curious new understanding about what happens with the body after we die.
Metal-like materials have been discovered in a very strange place.
- Bristle worms are odd-looking, spiky, segmented worms with super-strong jaws.
- Researchers have discovered that the jaws contain metal.
- It appears that biological processes could one day be used to manufacture metals.
The bristle worm, also known as polychaetes, has been around for an estimated 500 million years. Scientists believe that the super-resilient species has survived five mass extinctions, and there are some 10,000 species of them.
Be glad if you haven't encountered a bristle worm. Getting stung by one is an extremely itchy affair, as people who own saltwater aquariums can tell you after they've accidentally touched a bristle worm that hitchhiked into a tank aboard a live rock.
Bristle worms are typically one to six inches long when found in a tank, but capable of growing up to 24 inches long. All polychaetes have a segmented body, with each segment possessing a pair of legs, or parapodia, with tiny bristles. ("Polychaeate" is Greek for "much hair.") The parapodia and its bristles can shoot outward to snag prey, which is then transferred to a bristle worm's eversible mouth.
The jaws of one bristle worm — Platynereis dumerilii — are super-tough, virtually unbreakable. It turns out, according to a new study from researchers at the Technical University of Vienna, this strength is due to metal atoms.
Metals, not minerals
Fireworm, a type of bristle wormCredit: prilfish / Flickr
This is pretty unusual. The study's senior author Christian Hellmich explains: "The materials that vertebrates are made of are well researched. Bones, for example, are very hierarchically structured: There are organic and mineral parts, tiny structures are combined to form larger structures, which in turn form even larger structures."
The bristle worm jaw, by contrast, replaces the minerals from which other creatures' bones are built with atoms of magnesium and zinc arranged in a super-strong structure. It's this structure that is key. "On its own," he says, "the fact that there are metal atoms in the bristle worm jaw does not explain its excellent material properties."
Just deformable enough
Credit: by-studio / Adobe Stock
What makes conventional metal so strong is not just its atoms but the interactions between the atoms and the ways in which they slide against each other. The sliding allows for a small amount of elastoplastic deformation when pressure is applied, endowing metals with just enough malleability not to break, crack, or shatter.
Co-author Florian Raible of Max Perutz Labs surmises, "The construction principle that has made bristle worm jaws so successful apparently originated about 500 million years ago."
Raible explains, "The metal ions are incorporated directly into the protein chains and then ensure that different protein chains are held together." This leads to the creation of three-dimensional shapes the bristle worm can pack together into a structure that's just malleable enough to withstand a significant amount of force.
"It is precisely this combination," says the study's lead author Luis Zelaya-Lainez, "of high strength and deformability that is normally characteristic of metals.
So the bristle worm jaw is both metal-like and yet not. As Zelaya-Lainez puts it, "Here we are dealing with a completely different material, but interestingly, the metal atoms still provide strength and deformability there, just like in a piece of metal."
Observing the creation of a metal-like material from biological processes is a bit of a surprise and may suggest new approaches to materials development. "Biology could serve as inspiration here," says Hellmich, "for completely new kinds of materials. Perhaps it is even possible to produce high-performance materials in a biological way — much more efficiently and environmentally friendly than we manage today."
Dealing with rudeness can nudge you toward cognitive errors.
- Anchoring is a common bias that makes people fixate on one piece of data.
- A study showed that those who experienced rudeness were more likely to anchor themselves to bad data.
- In some simulations with medical students, this effect led to higher mortality rates.
Cognitive biases are funny little things. Everyone has them, nobody likes to admit it, and they can range from minor to severe depending on the situation. Biases can be influenced by factors as subtle as our mood or various personality traits.
A new study soon to be published in the Journal of Applied Psychology suggests that experiencing rudeness can be added to the list. More disturbingly, the study's findings suggest that it is a strong enough effect to impact how medical professionals diagnose patients.
Life hack: don't be rude to your doctor
The team of researchers behind the project tested to see if participants could be influenced by the common anchoring bias, defined by the researchers as "the tendency to rely too heavily or fixate on one piece of information when making judgments and decisions." Most people have experienced it. One of its more common forms involves being given a particular value, say in negotiations on price, which then becomes the center of reasoning even when reason would suggest that number should be ignored.
It can also pop up in medicine. As co-author Dr. Trevor Foulk explains, "If you go into the doctor and say 'I think I'm having a heart attack,' that can become an anchor and the doctor may get fixated on that diagnosis, even if you're just having indigestion. If doctors don't move off anchors enough, they'll start treating the wrong thing."
Lots of things can make somebody more or less likely to anchor themselves to an idea. The authors of the study, who have several papers on the effects of rudeness, decided to see if that could also cause people to stumble into cognitive errors. Past research suggested that exposure to rudeness can limit people's perspective — perhaps anchoring them.
In the first version of the study, medical students were given a hypothetical patient to treat and access to information on their condition alongside an (incorrect) suggestion on what the condition was. This served as the anchor. In some versions of the tests, the students overheard two doctors arguing rudely before diagnosing the patient. Later variations switched the diagnosis test for business negotiations or workplace tasks while maintaining the exposure to rudeness.
Across all iterations of the test, those exposed to rudeness were more likely to anchor themselves to the initial, incorrect suggestion despite the availability of evidence against it. This was less significant for study participants who scored higher on a test of how wide of a perspective they tended to have. The disposition of these participants, who answered in the affirmative to questions like, "Before criticizing somebody, I try to imagine how I would feel if I were in his/her place," was able to effectively negate the narrowing effects of rudeness.
What this means for you and your healthcare
The effects of anchoring when a medical diagnosis is on the line can be substantial. Dr. Foulk explains that, in some simulations, exposure to rudeness can raise the mortality rate as doctors fixate on the wrong problems.
The authors of the study suggest that managers take a keener interest in ensuring civility in workplaces and giving employees the tools they need to avoid judgment errors after dealing with rudeness. These steps could help prevent anchoring.
Also, you might consider being nicer to people.