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11 Squeaky-Clean Facts About Spit

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Though most people find the thought of saliva rather disgusting, spit plays a vital role in our lives. It allows us to comfortably chew, swallow, and digest. It fights off bacteria in our mouths and elsewhere, and leads the mouth’s bold fight against cavities. Here are 11 facts that might have you reconsidering that unsung hero of bodily fluids: spit. 

1. IT’S MOSTLY WATER. 

Saliva consists of about 99 percent water. The other 1 percent is made up of electrolytes and organic substances, including digestive enzymes and small quantities of uric acid, cholesterol, and mucins (the proteins that form mucus). 

2. THERE’S A MEDICAL STANDARD FOR HOW MUCH YOU SHOULD DROOL. 

Healthy individuals accumulate between 2 to 6 cups of spit a day. That’s without stimulation from activities like eating or chewing gum, which open the spit floodgates [PDF]. 

3. SALIVA PRODUCTION HAS A CIRCADIAN RHYTHM.

Your body typically produces the most saliva in the late afternoon, and the least at night. Salivation is controlled by the autonomic nervous system (much like your heartbeat), meaning it’s an unconscious process. 

4. THERE ARE FIVE DIFFERENT KINDS OF SPIT.

Salivation has five distinct phases, most triggered by the passage of food through the body. Not all of them are a good thing. The first type of salivation is cephalic, the kind that occurs when you see or smell something delicious. The buccal phase is the body’s reflexive response to the actual presence of food in the mouth (which aids in swallowing). The oesophageal involves the stimulation of the salivary glands as food moves through the oesophogus. The gastric phase happens when something irritates your stomach—like when you’re just about to puke. The intestinal phase is triggered by a food that doesn’t agree with you passing through the upper intestine. 

5. IT CAN BATTLE BACTERIA. 

There’s a reason the phrase “lick your wounds” came about. Spit is full of infection-battling white blood cells. And, according to a 2015 study in the journal Blood, neutrophils—a type of white blood cell—are more effective at killing bacteria if they come from saliva than from anywhere else in the body. So adding saliva to a wound gives the body a powerful backup as it fights off infection. 

6. IT KEEPS YOU FROM GETTING CAVITIES.

The calcium, fluoride, and phosphate in saliva strengthen your teeth. Spit also fights cavity-causing bacteria, washes away bits of food, and neutralizes plaque acids, reducing tooth decay and cavities. That’s why chewing gum gets dentists’ stamp of approval—chewing increases the flow of saliva, thus protecting your oral health. 

7. YOU NEED IT IF YOU WANT TO TASTE ANYTHING. 

Saliva acts like a solvent for tastes, ferrying dissolved deliciousness to the sites of taste receptors. It also keeps those receptors healthy by keeping them from drying out and protecting them from bacterial infection. Many people who have dry mouth (xerostomia) find their sense of taste affected by their oral cavity’s parched conditions. Because many medications have dry mouth as a side effect, scientists have developed artificial saliva sprays that mimic the lubrication of real spit. 

8. SWAPPING SPIT EXCHANGES MILLIONS OF BACTERIA. 

A 10-second kiss involves the transfer of some 80 million bacteria, one study found. 

9. PEOPLE AREN’T BORN DROOLING. 

Babies don’t start drooling until they’re two to four months old. Unfortunately, they also don’t really know what to do with their spit. They don’t have full control of the muscles of their mouth until they’re around two years old, so they can’t really swallow it effectively. Which is why we invented bibs. 

10. STRESS CAN LEAVE YOU SPIT-LESS. 

The body’s fight-or-flight response is designed to give you the energy and strength needed to overcome a near-death experience, like, say, running into a bear, or, more common in the modern age, giving a big presentation at work. Your blood pressure goes up, the heart beats faster, and the lungs take in more oxygen. This is not the time to sit around and digest a meal, so the digestion system slows down production, including that of saliva

11. A LACK OF SPIT WAS ONCE USED AS AN ADMISSION OF GUILT. 

In some ancient societies, saliva was used as a basic lie detector. In ancient India, accused liars had to chew grains of rice. If they were telling the truth, they would have enough saliva to spit them back out again. If someone was lying, their mouth would go dry and the rice would stick in their throat. 

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Animals
If You Want Your Cat to Poop Out More Hairballs, Try Feeding It Beets
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Have you ever wondered if there’s a way to get your cat to poop out its hairballs instead of hacking them up? If so, you’re likely a seasoned cat owner whose tolerance for gross stuff has reached the point of no return. Luckily, there may be an easy way to get your cat to dispose of hairballs in the litter box instead of on your carpet, according to one study.

The paper, published in the Journal of Physiology and Animal Nutrition, followed the diets of 18 mixed-breed short-haired cats over a month. Some cats were fed straight kibble, while others were given helpings of beet pulp along with their regular meals. The researchers suspected that beets, a good source of fiber, would help move any ingested hair through the cats’ digestive systems, thus preventing it from coming back up the way it went in. Following the experiment, they found that the cats with the beet diet did indeed poop more.

The scientists didn’t measure how many hairballs the cats were coughing up during this period, so it's possible that pooping out more of them didn’t stop cats from puking them up at the same rate. But considering hairballs are a matter of digestive health, more regular bowel movements likely reduced the chance that cats would barf them up. The cat body is equipped to process large amounts of hair: According to experts, healthy cats should only be hacking hairballs once or twice a year.

If you find them around your home more frequently than that, it's a good idea to up your cat's fiber intake. Raw beet pulp is just one way to introduce fiber into your pet's diet; certain supplements for cats work just as well and actually contain beet pulp as a fiber source. Stephanie Liff, a veterinarian at Pure Paws Veterinary Care in New York, recommends psyllium powder to her patients. Another option for dealing with hairballs is the vegetable-oil based digestive lubricant Laxatone: According to Dr. Liff, this can "help to move hairballs in the correct direction."

[h/t Discover]

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Don't Pour Alcohol on Your Bed Bugs—Try These Tips Instead
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Getting bed bugs is a nightmare experience, one that’s sure to cost you oodles of time, money, and emotional distress. The bugs are painfully hard to purge from your household, and it’s getting even harder as they become more resistant to common insecticides. Unfortunately, home remedies are often no match for these parasitic insects. Dousing them with rubbing alcohol (a tip you'll often hear) won’t kill them; in fact, it might just burn your house down, as a woman trying to rid her Cincinnati apartment of bed bugs found out recently. As The Washington Post reported, the alcohol in that case was too close to the flame of a candle or some type of incense, and ignited. It wasn't an isolated incident.

In the last 10 years or so, people trying to kill bed bugs with alcohol have started several house fires across the U.S., including a different incident in Cincinnati just two weeks ago. So short of burning down your entire house and starting over, how do you get rid of them?

The short answer is: Give up on the idea of saving money and call an exterminator. According to 2014 research, plenty of DIY bed bug-killing remedies are woefully ineffective. Rubbing alcohol, in fact, only killed half of the insects sprayed by the Rutgers University researchers in that study. Researchers have found that other recommended home remedies, like moth balls, foggers, or ultrasonic bug repellers, are even less effective. And don’t even think about using “natural” type products that use essential oils as the main ingredient. They might smell nice, but they won’t help your bug problem.

But before you call in the big guns, there are a few effective, concrete steps you can take to reduce your infestation. As Rutgers bedbug specialists Changlu Wang and Richard Cooper wrote in their bed bug fact sheet, putting your belongings in plastic storage bins or garbage bags is a good place to start. Since the bugs don’t like to climb on smooth plastic, this can help contain the infestation. Just make sure to treat whatever you’re putting inside the bags or bins first by putting them through the hot laundry, steaming, heating, or freezing them.

You’ll need a mattress encasement, too. This will keep the bugs that have already infested your mattress from escaping, meaning they won’t be able to feast on you anymore and will die of starvation. Nor will any new bugs be able to get inside to nest. You’ll want to make sure it’s a scientifically tested brand, though, since not all mattress encasements are bite-proof or escape-proof for bed bugs. (Most experts recommend the Protect-a-Bed BugLock encasement, which costs about $81 for the queen-sized version.)

Next, pick up some bed bug traps. Set them up under the legs of your furniture and around the perimeter of rooms to help detect new infestations and reduce existing ones. According to Wang and Cooper, a one-bedroom apartment might need eight to 12 of these traps, while bigger apartments will require more.

You’ll want to expose all your belongings to extreme temperatures before you even think about touching them again. Putting them through the washer/dryer on its hottest setting will do the trick to kill both bugs and their eggs, but if you need to eradicate bugs lurking in items you can’t wash, you can freeze them in plastic bags (as long as your freezer gets down to 0°F). You can also kill them with a steam cleaner, especially if you need to purge them from your couch or other upholstered furniture.

If you’ve still got a large number of bugs lurking in your house, you can tackle them with a vacuum cleaner, sucking them out of seams, zippers, trim, and other furniture crevices. But you’ll want to use a stocking or some other method of protecting your vacuum from being infested itself. (See Figure 6 here.)

Some research has also found that desiccant dusts that dehydrate bugs to death, like diatomaceous earth and silica gel, can be effective at controlling bed bug infestations (silica gel in particular) when spread around the perimeters of rooms, on bed frames and couches, and on furniture legs.

As we mentioned before, you’ll probably want to consult a professional even if you do all of the above, because if you miss even one bug or egg, you'll be back to where you started. The cost of an exterminator pales in comparison to the cost of throwing out everything you own, moving homes, and then realizing you’ve brought the bed bugs with you anyway.

The bad news for anyone who’s already infested is that prevention really is key when it comes to bed bugs. So brush up on what the pests look like, make sure to check your hotel room for them when you travel, and if you spot them in your apartment, make sure to warn your neighbors.

[h/t The Washington Post]

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