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Can Stress Really Cause Hair Loss?

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People have long been known to willfully pull out their own hair owing to anxiety, but it’s widely believed that chronic stress can cause inadvertent hair loss as well. Although androgenic alopecia, better known as male/female pattern baldness, is the primary culprit for shedding in most, physiological changes spurred by frequent, intense stressors can also lead to clogged shower drains.

To understand how stress can make our hair fall out, we have to look into how hair grows to begin with. The life cycle of a hair plays out in three stages. The first of these, anagen, accounts for 90 percent of our hair and is the active phase in the process, during which cells in the follicle root divide and form a fledgling hair. This new hair continues to grow and pushes the old hair above it (known as a club hair) up the follicle and out. The new hair will grow at about half an inch per month during this phase, which lasts anywhere from 2 to 6 years.

When the next stage, catagen, kicks in, the hair has stopped growing and it enters a 2 to 3 week transitional phase where it becomes a club hair. At any one time, 3 percent of our hair is in this phase. Here the root sheath in the follicle shrinks and attaches to the base of the hair. As the hair is no longer attached to a blood supply, it stops growing and enters the next phase, telogen. Some 8 percent of our hair is typically in this stage, at rest. Hairs hang out here for about three months, and are then shed in the course of normal daily activity. (A shed hair in telogen will have a telltale hard, white bulb at the root, which means it has lived a normal life.)

Bad Hair Days

In tracing stress-related hair loss, telogen is the key phase. When someone is faced with a powerful stressor, like divorce or illness, or goes through a life-changing event, like childbirth, the body can inexplicably trigger much of their hair to enter this resting period, causing it to fall out pretty much all at once a few months later. Known as telogen effluvium, doctors believe it’s simply the body’s way of taking a time-out while larger problems, be it recovery or coping, are addressed. So, a relentlessly trying week at work won’t cause you to lose your hair, but a relentlessly difficult year might. Luckily, once the stressor is addressed or eliminated, the growth process will often regain its normal rhythm and the hair lost during the stress event will come back, though it can take up to nine months.

Some of the physiological stressors commonly linked to hair loss include rapid weight loss/gain, caloric deficiency, and, in women, hormone fluctuations following childbirth or switching/stopping oral contraceptives. Even though physiological change is the underlying cause of stress-related hair loss, added emotional stress can exacerbate the effects, leading to a more pronounced bout of shedding. As we age, the growing cycle slows like most other body processes, so periods of stress during middle age and later in life can make it that much harder for the hair to fully recover.

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Big Questions
Why Don't We Eat Turkey Tails?
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Turkey sandwiches. Turkey soup. Roasted turkey. This year, Americans will consume roughly 245 million birds, with 46 million being prepared and presented on Thanksgiving. What we don’t eat will be repurposed into leftovers.

But there’s one part of the turkey that virtually no family will have on their table: the tail.

Despite our country’s obsession with fattening, dissecting, and searing turkeys, we almost inevitably pass up the fat-infused rear portion. According to Michael Carolan, professor of sociology and associate dean for research at the College for Liberal Arts at Colorado State University, that may have something to do with how Americans have traditionally perceived turkeys. Consumption was rare prior to World War II. When the birds were readily available, there was no demand for the tail because it had never been offered in the first place.

"Tails did and do not fit into what has become our culinary fascination with white meat," Carolan tells Mental Floss. "But also from a marketing [and] processor standpoint, if the consumer was just going to throw the tail away, or will not miss it if it was omitted, [suppliers] saw an opportunity to make additional money."

Indeed, the fact that Americans didn't have a taste for tail didn't prevent the poultry industry from moving on. Tails were being routed to Pacific Island consumers in the 1950s. Rich in protein and fat—a turkey tail is really a gland that produces oil used for grooming—suppliers were able to make use of the unwanted portion. And once consumers were exposed to it, they couldn't get enough.

“By 2007,” according to Carolan, “the average Samoan was consuming more than 44 pounds of turkey tails every year.” Perhaps not coincidentally, Samoans also have alarmingly high obesity rates of 75 percent. In an effort to stave off contributing factors, importing tails to the Islands was banned from 2007 until 2013, when it was argued that doing so violated World Trade Organization rules.

With tradition going hand-in-hand with commerce, poultry suppliers don’t really have a reason to try and change domestic consumer appetites for the tails. In preparing his research into the missing treat, Carolan says he had to search high and low before finally finding a source of tails at a Whole Foods that was about to discard them. "[You] can't expect the food to be accepted if people can't even find the piece!"

Unless the meat industry mounts a major campaign to shift American tastes, Thanksgiving will once again be filled with turkeys missing one of their juicier body parts.

Have you got a Big Question you'd like us to answer? If so, let us know by emailing us at bigquestions@mentalfloss.com.

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Big Questions
Why Do We Dive With Sharks But Not Crocodiles?
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Why do we dive with sharks but not crocodiles?

Eli Rosenberg:

The issue is the assumption that sharks' instincts are stronger and more basic.

There are a couple of reasons swimming with sharks is safer:

1. Most sharks do not like the way people taste. They expect their prey to taste a certain way, like fish/seal, and we do not taste like that. Sharks also do not like the sensation of eating people. Bigger sharks like great whites enjoy prey with a high fat-bone ratio like seals. Smaller sharks enjoy eating fish, which they can gobble in one bite. So, while they might bite us, they pretty quickly decide “That’s not for me” and swim away. There is only one shark that doesn’t really care about humans tasting icky: that shark is our good friend the tiger shark. He is one of the most dangerous species because of his nondiscriminatory taste (he’s called the garbage can of the sea)!

2. Sharks are not animals that enjoy a fight. Our big friend the great white enjoys ambushing seals. This sneak attack is why it sometimes mistakes people for seals or sea turtles. Sharks do not need to fight for food. The vast majority of sharks species are not territorial (some are, like the blacktip and bull). The ones that are territorial tend to be the more aggressive species that are more dangerous to dive with.

3. Sharks attacked about 81 people in 2016, according to the University of Florida. Only four were fatal. Most were surfers.

4. Meanwhile, this is the saltwater crocodile. The saltwater crocodile is not a big, fishy friend, like the shark. He is an opportunistic, aggressive, giant beast.


5. Crocodiles attack hundreds to thousands of people every single year. Depending on the species, one-third to one-half are fatal. You have a better chance of survival if you played Russian roulette.

6. The Death Roll. When a crocodile wants to kill something big, the crocodile grabs it and rolls. This drowns and disorients the victim (you). Here is a PG video of the death roll. (There is also a video on YouTube in which a man stuck his arm into an alligator’s mouth and he death rolled. You don’t want to see what happened.)

7. Remember how the shark doesn’t want to eat you or fight you? This primordial beast will eat you and enjoy it. There is a crocodile dubbed Gustave, who has allegedly killed around 300 people. (I personally believe 300 is a hyped number and the true number might be around 100, but yikes, that’s a lot). Gustave has reportedly killed people for funsies. He’s killed them and gone back to his business. So maybe they won’t even eat you.


8. Sharks are mostly predictable. Crocodiles are completely unpredictable.

9. Are you in the water or by the edge of the water? You are fair game to a crocodile.

10. Crocodiles have been known to hang out together. The friend group that murders together eats together. Basks of crocodiles have even murdered hippopotamuses, the murder river horse. Do you think you don't look like an appetizer?

11. Wow, look at this. This blacktip swims among the beautiful coral, surrounded by crystal clear waters and staggering biodiversity. I want to swim there!

Oh wow, such mud. I can’t say I feel the urge to take a dip. (Thanks to all who pointed this out!)

12. This is not swimming with the crocodiles. More like a 3D aquarium.

This post originally appeared on Quora. Click here to view.

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