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Study Shows Thumb-Sucking and Nail-Biting Can Be Good For Kids

HughPickens.com writes: Perri Klass M.D. writes in the NYT that according to a new study of children aged 5 to 11, thumb-suckers and nail-biters were less likely to have positive allergic skin tests later in life. In the study, parents were asked about their children's nail-biting and thumb-sucking habits when the children were 5, 7, 9 and 11 years old. skin testing for allergic sensitization to a range of common allergens including dust mites, grass, cats, dogs, horses and common molds was done when the children were 13 years old, and then later when they were 32. The study found that children who frequently sucked a thumb or bit their nails were significantly less likely to have positive allergic skin tests both at 13 and again at 32. Children with both habits were even less likely to have a positive skin test than those with only one of the habits. The question of such a connection arose because of the so-called hygiene hypothesis, an idea originally formulated in 1989, that there may be a link between atopic disease -- the revved-up action of the immune system responsible for eczema, asthma and allergy -- and a lack of exposure to various microbes early in life. Some exposure to germs, the argument goes, may help program a child's immune system to fight disease, rather than develop allergies. "The hygiene hypothesis is interesting because it suggests that lifestyle factors may be responsible for the rise in allergic diseases in recent decades," says Robert J. Hancox. "Obviously hygiene has very many benefits, but perhaps this is a downside. The hygiene hypothesis is still unproven and controversial, but this is another piece of evidence that it could be true." Although the results do not suggest that kids should take up these habits, the findings do suggest the habits help protect against allergies that persist into adulthood.

75 comments

  1. If you want buck teeth by Anonymous Coward · · Score: 0

    but if you don't, don't.

    1. Re:If you want buck teeth by fruviad · · Score: 1

      but if you don't, don't.

      I was the only kid in my family of 5 kids who sucked their thumb. I was also the only kid in the family of 5 kids who didn't have braces. Every new dentist I go to asks me when I got my braces off.

      Nice try...but try again.

    2. Re:If you want buck teeth by Anonymous Coward · · Score: 0

      Anecdote is not the plural of data....

    3. Re:If you want buck teeth by fruviad · · Score: 1

      Parent made a blanket statement. I provided an example in which the blanket statement was incorrect.

      Blanket statements are also not data.

    4. Re:If you want buck teeth by Anonymous Coward · · Score: 0

      However the ADA seems to agree with the poster's blanket statement.

      http://www.mouthhealthy.org /en/az-topics/t/thumbsucking

      After permanent teeth come in, sucking may cause problems with the proper growth of the mouth and alignment of the teeth. It can also cause changes in the roof of the mouth.

      Pacifiers can affect the teeth essentially the same ways as sucking fingers and thumbs, but it is often an easier habit to break.

      The intensity of the sucking is a factor that determines whether or not dental problems may result. If children rest their thumbs passively in their mouths, they are less likely to have difficulty than those who vigorously suck their thumbs. Some aggressive thumbsuckers may develop problems with their baby (primary) teeth.

    5. Re:If you want buck teeth by Anonymous Coward · · Score: 0

      But the singular of data is anecdote.

    6. Re:If you want buck teeth by dcw3 · · Score: 1

      And three rights make a left.

      --
      Just another day in Paradise
    7. Re:If you want buck teeth by Anonymous Coward · · Score: 0

      That there's funny...

  2. What about nose-pickers? by Anonymous Coward · · Score: 5, Funny

    I'm asking for a friend.

    1. Re:What about nose-pickers? by Anonymous Coward · · Score: 2, Funny

      they were found to be more likely to be overweight social outcasts.

    2. Re: What about nose-pickers? by Anonymous Coward · · Score: 0

      Only booger eaters benefit, not pickers-only.

    3. Re:What about nose-pickers? by drainbramage · · Score: 1

      Because thanks ti PhotoShop you CAN pick a friends nose!

      --
      No brain, no pain.
    4. Re: What about nose-pickers? by Anonymous Coward · · Score: 1

      As much as that comment was probably intended as a troll, it is technically accurate.

      Similar to biting fingernails (more importantly, biting the stuff that gets caught under fingernails), it benefits from the basic principles of vaccination and controlled exposure. Small samples of local pathogens caught in the mucous filter and then passed near your tonsils (major lymph nodes) and digestive system (really good at killing cells and isolating organic compounds for future use/analysis) provide immune system awareness of surroundings. This helps prevent over-reactions like allergies and gives sampling to arm T-cells for a non-trivial viral exposure.

    5. Re:What about nose-pickers? by Anonymous Coward · · Score: 0

      Only if you eat what you extract

    6. Re:What about nose-pickers? by PrescriptionWarning · · Score: 2

      Well my "friend" doesn't suck thumbs or bite nails, so that would be the only other reason for no allergies for me. I mean my friend!

    7. Re:What about nose-pickers? by Anonymous Coward · · Score: 1

      If cocksucking improves the immune system then your mom should live forever!

    8. Re:What about nose-pickers? by antdude · · Score: 1

      What about ear, butthole, etc. pickers? :P

      --
      Ant(Dude) @ Quality Foraged Links (AQFL.net) & The Ant Farm (antfarm.ma.cx / antfarm.home.dhs.org).
  3. Everything they siad was wrong by Anonymous Coward · · Score: 1

    Wanking is good for you. Biting your nails is good for you. What a waste of time those school hygiene talks were

  4. What a pity! by Bristol_92 · · Score: 1

    In my childhood I bit my nails. My parents abused me and tried to wean from a habit. But if they knew about its helpfulness, their opinion had been change. Or not. Because this study colour me weird.

    1. Re:What a pity! by Anonymous Coward · · Score: 1

      I bit my nails as a kid and despite years of trying my nails are an awful mess, always wish my parents had pushed harder to stop it. Anecdotally, never had any remote problem with allergies, also rarely get sick.

    2. Re:What a pity! by Anonymous Coward · · Score: 0

      Two things got me to stop biting my nails. I stopped "checking". Nail biters know what this is, where you absentmindedly run your finger over your nail. The other was to always have a pair of clippers handy, so that when I *did* check, or I found myself with my finger already in my mouth, I would use the scissors to trim whatever it was that I wanted to bite.
      Now my nails are not perfect by any means, but they are no longer embarrassing.
      It took me decades to figure this out.

    3. Re: What a pity! by Anonymous Coward · · Score: 0

      I've bitteb my nails my whole life. In my 40's now. I cut my nails probably about 20% of time. I've become so skilled at it that my fingernails look perfect. At least for a man.

  5. How about finger bang? by Anonymous Coward · · Score: 0
  6. Evolutionary Behaviors by Anonymous Coward · · Score: 0

    Newsflash! Behaviors that evolve over time do so because they improve the survival of the species.

    1. Re:Evolutionary Behaviors by jellomizer · · Score: 2

      However a lot of natural behaviors have been discouraged by changing cultural norms.
      While people are freaking out about GMO and other devious actions by big agro food for all these allergies, Where the true cause may just be our new bubble hyper clean life style, where kids are seen as ultra fragile and in some areas laws will punish parents who raise their kids in a manner where they are exposed to such dirty behaviors.

      --
      If something is so important that you feel the need to post it on the internet... It probably isn't that important.
    2. Re:Evolutionary Behaviors by dcw3 · · Score: 1

      Exactly, and it's interesting that allergy rates differ based upon where you were born...

      From http://www.ncbi.nlm.nih.gov/pm...
      The reasons for this stark difference in peanut allergy compared to the western population are not known. It is tempting to speculate that early exposure to peanut which is cooked braised or boiled may be one of the reasons for the development of tolerance, as Asians including children are often exposed to peanut rice porridge. It has been shown that roasting of peanuts increases its allergenicity [56]. However, other environmental factors that modulate mucosal immunity of the gut and induce mucosal tolerance may also be implicated and requires further study. Environmental influences are suggested by studies on migrant populations (see section below on Risk factors for food allergy). In the Singapore survey, it was shown that irrespective of ethnicity, those born in Asia had lower risk of peanut and tree nut compared to those born in Western countries

      --
      Just another day in Paradise
  7. A Slightly Better Article by newcastlejon · · Score: 3, Informative

    NYT spends as many inches on name dropping the researchers as it does explaining the research. The NHS has released an article that's a little better IMO.

    tl;dr Research paper shows correlation between nail biting in childhood and incidence of allergies in later life, does not elaborate on causal relationship. Results hailed as "common sense" by the usual crowd.

    --
    If God forks the Universe every time you roll a die, he'd better have a damned good memory.
  8. Not really by argStyopa · · Score: 1

    If the hypothesis is right, the point isn't the thumb-sucking or nail-biting, it's the exposure to bacteria, and there's a ton of other ways to do that.

    Thumb-sucking in particular often correlates with tooth alignment issues later in life, so perhaps just stop sterilizing the shit out of everything around your kid and they'll get the same benefit without needing braces later?

    --
    -Styopa
    1. Re: Not really by Anonymous Coward · · Score: 1

      Yeah, we should be licking other people for maximum effeciency!

    2. Re:Not really by rmdingler · · Score: 1
      Thiss. Fresh air and outdoor exposure early in life, an environment with a dog or cat during infancy, and even eating a little dirt... all great immune system boosters.

      YMMV, but we raised a child with allergies so severe he would wind up in the hospital every spring from 0-3 years of age. With a family history of asthma, we chose to let him strengthen his immune system playing in the dirt with the other children, rather than keeping him inside in the bubble. He is (mostly) grown now with few breathing issues, other than a worse than average aversion to the flu & colds.

      --
      Happiness in intelligent people is the rarest thing I know.

      Ernest Hemingway

    3. Re:Not really by Anonymous Coward · · Score: 0

      Just eat dirt...some recent articles about that as well...same correlation (not causation) ...dirt eaters are happier and healthier...

  9. Another uncheckable study by OpenSourced · · Score: 1

    You cannot check this for causation. Does the habit cause later protection, or does per-existing protection cause the habit? No way of doing a controlled study, as feeding nails to random children (even own nails) can be frowned upon.

    Anyway, if it can help reduce the all-encompassing parent anxiety about anything their precious child does, it's welcome.

    --
    Rome taught me patience and assiduous application to detail. Virtues which temper the boldness of great, general views.
  10. Not worth the other issues by SirCowMan · · Score: 4, Insightful

    Sucking thumbs won't make you immune to allergies.. but it does make it quite likely you'll need dental work, the upper teeth get pushed out, the lower teeth pushed back, and if done regularly can result in requiring a rickanator to correct the jaw position and speech pathology to correct speech. If at all possible, get a pile of similar soothers, rotate them to dissuade a preference, and wean off as the kid gets around 4. No problems then, probably get just as much dirt in their mouth as kids will be dropping them all the time anyway.

    --
    !Equality through palindromes semordnilap hguorht ytilauqE!
    1. Re:Not worth the other issues by Anonymous Coward · · Score: 0

      [citation needed]

      I thumb sucked for years and my jaws and teeth were aligned just fine (until my wisdom teeth came in)

    2. Re:Not worth the other issues by Anonymous Coward · · Score: 0

      I thumb sucked for years and my mouth is completely screwed up as the GP described. The orthodontist wanted to break my jaw to rearrange my teeth and happily my parents said no. I can't bite directly into anything as the edges of my front teeth are never aligned. Eating fruit like apples is difficult. My lower teeth have slowly worn away the inside of my upper teeth thus leading to thinning and weakening teeth. The lower teeth push the upper ones out until they're fully in-front of the lower teeth.

      Some sounds are hard to make as I can't make a complete seal with my tongue against the back of my teeth so all the air I was going to use for that sound or word just suddenly escapes. It's like a brain fart. Like trying to raise your arm straight out and not realizing it was already straight out, so it's instead suddenly raised above your head. You have a WTF just happened moment that interrupts everything in your head and you have to regain your previous line of thought. When that happens while saying words, it sounds worse than stuttering and people think you're dumb. Having below average speech skills quickly leads to social anxiety which leads to fewer friends and poor social skills.

        I had no idea childhood thumb sucking would cause such profound effects later in my life. I'd recommend everyone to discourage it by providing alternatives, such as a favorite blanket or stuffed animal. A lot of kids suck because it feels comforting so find them something else, improve their self confidence, and/or remove their stressors. Just telling a kid to stop isn't good enough because from their eyes' you're telling them to stop doing something good. Kids never listen to that.

  11. Unproven by gringer · · Score: 3, Interesting

    The hygiene hypothesis is still unproven and controversial

    That's not quite correct; "unproven" is a confusing word here. It's more of an "it depends" situation, rather than a "true/false" situation.

    The hygiene hypothesis can be sort-of demonstrated in some situations (e.g. reduced allergic response to peanuts in mice via oral sensitisation with very low amounts of CpG-coated peanut extract), and rejected in others (e.g. the parasitic worm H. polygyrus suppresses the adaptive immune response).

    --
    Ask me about repetitive DNA
    1. Re:Unproven by wvmarle · · Score: 2

      What should be looked into more are things like nut allergy. It seems that every other US kid has some kind of nut allergy, often severe and potentially life threatening, while in Europe it's rare and in Asia it's pretty much a non-issue.

      One notable difference: in the US, parents are advised to stay clear of peanuts and other nuts for the first year or so, until sure there is no allergy.

      In Asia, peanut oil is some of the most commonly used cooking oils, peanuts and other nuts are used in food big time, and children start munching nuts the moment their teeth are strong enough. The latter is also pretty much the case in Europe. Kids are not separated from nuts.

      Correlation is not causation, of course, but it's pretty much proven that exposure to germs makes one resistant or even immune to them; it should be expected that the same accounts for allergens. So keeping kids away from nuts may actually cause nut allergy.

    2. Re:Unproven by orgelspieler · · Score: 1

      My son's dairy allergy was present from the get go. He barfed all over the place his second exposure to dairy. Don't know about the peanut allergy, because my wife is allergic, so they weren't ever in the house to begin with. There are a lot of things that are very prevalent in the US of A that aren't as common in other places. But in my opinion it's just a matter of having outsmarted Darwin. 100 years ago, my father would have died in childhood due to his asthma. Instead, he passed that gene along to me. I too would have died in childhood. And now my son is poised to spread his own genetic misery on to the next generation.

    3. Re:Unproven by Anonymous Coward · · Score: 0

      What should be looked into more are things like nut allergy. It seems that every other US kid has some kind of nut allergy, often severe and potentially life threatening, while in Europe it's rare and in Asia it's pretty much a non-issue.

      One notable difference: in the US, parents are advised to stay clear of peanuts and other nuts for the first year or so, until sure there is no allergy.

      In Asia, peanut oil is some of the most commonly used cooking oils, peanuts and other nuts are used in food big time, and children start munching nuts the moment their teeth are strong enough. The latter is also pretty much the case in Europe. Kids are not separated from nuts.

      Correlation is not causation, of course, but it's pretty much proven that exposure to germs makes one resistant or even immune to them; it should be expected that the same accounts for allergens. So keeping kids away from nuts may actually cause nut allergy.

      Those stats really do need to at least be cross checked with the infant/early childhood mortality rates.

      It'd be pretty embarrassing if it turned out the explore was juts culling the allergic early rather than conditioning a more measured immune responce to the alergins later in life.

    4. Re:Unproven by wvmarle · · Score: 1

      Makes you wonder what is in dairy that is not in breast milk. The most common chemical that causes reaction is lactose, but that's present in breast milk as well.

    5. Re:Unproven by dcw3 · · Score: 1
      --
      Just another day in Paradise
  12. Not 1989... by SeattleLawGuy · · Score: 1

    Saying it originated in 1989 is like saying gravity originated in the 1600s with Newton, or like saying the idea of America originated with Columbus.

    I personally know people who heard variations on the "hygiene hypothesis" from doctors in the 70s, although maybe nobody managed to get it published until later. But anybody with a brain would have tossed variations on it around casually in conversation once they understood we could build up resistance to things. Contrary to the certainty of all of us today, there really were smart people before we were around.

    --
    Real lawyers write in C++
    1. Re: Not 1989... by Anonymous Coward · · Score: 0

      When I grew up in central Europe in the 70s it was common sense that children have to get dirty to develop resistance against germs. Also that they need to be free to roam for most of the day so they would develop their own interest and curiosity instead of letting adults define their activities and be bored to death when no one gives directions. My parents did try to dissuade me from eating fingernails and boogers and caked blood, but at some point they gave up and I still enjoy doing it. Me and my siblings also went to the backyard pool with our parents, all naked, until the Catholic neighbors intervened. I often feel that our culture has evolved backwards since then.

  13. *Thumb* sucking by BlackPignouf · · Score: 1

    *Thumb* sucking is good for kids. Ooops, the catholic church got it all wrong!

    1. Re: *Thumb* sucking by Anonymous Coward · · Score: 0

      It's related. Masturbation, sucking your toes, nibbling your fingernails, they're all ways of bonding with your own body. There's a religious prejudice against anything relayed to bodily pleasures, especially if it doesn't serve to further their societal, familialist, procreationist ideology. Note that "stimming" is also pathologized as a symptom of mental disorders, even though it's obviously good for you.

  14. get a 4 legged ped for your child! by Anonymous Coward · · Score: 0

    problem solved

  15. Mucophagy by Anonymous Coward · · Score: 0

    It's also possible that we find out that mucophagy is beneficial to our health too.

    Damn, evolution, you gross!

    1. Re: Mucophagy by Anonymous Coward · · Score: 0

      Where do you think the dirty mucus goes if you don't sneeze it out?

  16. Trade Offs by Anonymous Coward · · Score: 0

    So less allergies, and the tradeoff is thousands of dollars in orthodontia work. Ahh the decisions to make as a parent.

  17. That what does not kill you ... by houghi · · Score: 1

    ... makes you stronger.

    Ever seen any kids. See where they put their hands? This will inderectly make their resistance stronger. And that leads to less illness.
    Together with better healthcare which means kids don't die and are already strong enough to battle those virusses and bacteria means better health.

    --
    Don't fight for your country, if your country does not fight for you.
    1. Re:That what does not kill you ... by wyHunter · · Score: 1

      Yes. I agree. You know what the saddest thing is though? There's all this discussion that 'oh kids have more allergies now because our homes are cleaner.' Absolutely not. I was born in the middle sixties and people had less stuff. Their houses had way less dirt than today. I'm guessing that one of the reasons why kids have more allergies is long chain molecules that outgas off of products produced in countries with lax manufacturing and environmental standards. There is perfume in EVERYTHING and these scents often have questionable chemicals in them.

    2. Re:That what does not kill you ... by fropenn · · Score: 1

      However for many infections, such as the un-fun norovirus, a person's immunity is temporary, not permanent. http://wwwnc.cdc.gov/eid/artic... So the exposure to these agents does not result in a stronger immune system but does result in additional illnesses. How do we, then, clean off the nasty critters but keep the "good" ones?

    3. Re:That what does not kill you ... by dcw3 · · Score: 1

      Kids aren't outside playing in the dirt nearly as much as in the 60s. My parents rarely knew where I was until they saw me come in for lunch or dinner back then. We didn't sit in front of a computer or Xbox all day, so in addition to the exposure, we were actually getting physical exercise.

      --
      Just another day in Paradise
    4. Re:That what does not kill you ... by wyHunter · · Score: 1

      I agree with you on that one. But I do wonder if they heterodyne; indoor air polluted with toxic scents and other things coupled with no exercise and no exposure to dirt etc.

  18. Don't forget picking your nose. by fredrated · · Score: 1

    A study done years ago suggested it gives the same benefits.

  19. beware! by Anonymous Coward · · Score: 0

    Thumb sucking can mess up how your teeth come in.

    And sometimes mess up your thumbnail into short weird things :(.

  20. Misleading conclusion by Anonymous Coward · · Score: 0

    Nail-biters and thumb-suckers have higher exposure to allergens due to putting their dirty fingers in their mouth. That's it.

    The article makes it sound like there's some kind of magic unknown link between the two. Those behaviors are classic indicators of psychological problems and are absolutely not a good thing.

  21. This is ridiculous. Stop it, Bob Saget. by adosch · · Score: 1

    I don't need to re-clarify the many points already made here about thumb make-out sessions ruin teeth or chewing on nails makes you look like you have mutant finger nails, ect. I agree with all of it.

    The point I will make is this just a new, generational way to shovel new, cute 'alternative-parenting' parents bullshit into stop their kids from having bad habits? Just plain ridiculous.

    If chewing on my toe jammed crusted nails, wiping my own shit under my nose like smelling salts, washing my face with soap and my own urine, drinking my own respiratory infection phlegm like Rocky Balboa raw egg shakes, eating my own mucus boogers would stop me from having real deal shit like cancer or some other terminal disease, then sign me up. Otherwise, show me out to get researching funding for outrageous hypothesis ideas. Sounds like a hoot!

  22. Re: Republicans raped me in Brazil by Anonymous Coward · · Score: 0

    Yes, because your posts are stupid and you should feel bad.

  23. getting to the point by CmdrTamale · · Score: 1

    Just eat more dirt.
    --
    I was a beta tester for dirt. We never did get all the bugs out.

  24. What about adults? by ketomax · · Score: 1

    Study Shows Thumb-Sucking and Nail-Biting Can Be Good For Kids

    What about Adults?

  25. Re:When desensitization fails: by Anonymous Coward · · Score: 0

    That wasn't a thumb that you were sucking, and it wasn't yours.

  26. Humans: 10% Human and 90% Bacteria by fustakrakich · · Score: 1

    If we bathe in mud and dirt we will be invincible!

    --
    “He’s not deformed, he’s just drunk!”
  27. In other news... by Errol+backfiring · · Score: 1

    Study Shows Sucking and Boot-Licking Pays off for Politicians

    --
    Nae king! Nae laird! Nae yurrupiean pressedent! We willna be fooled again!
  28. Cortisol by Anonymous Coward · · Score: 0

    When you are nervous, you bite your nails or suck your thumb. When you are nervous, your body produces more cortisol. Cortisol suppresses the immune response. Could this just be a correlation based on the common factor of general anxiety levels?

  29. Son finally... by Anonymous Coward · · Score: 0

    So finally "Science" gets round to discovering what intelligent people have known since year dot. "Let your kids ply in the dirt". Obviously not in heavily polluted poisonous dirt but in good old regular dirt. Take them a farm when they're small and get them to play with the goats/chickens/cows etc. Eat a few bugs/worms, get stung by the odd bee, wasp etc. etc.

    All those bacteria/germs/microbes will get into their systems and their immune system will learn how to cope and will grow up string and functioning.

    Keeping them indoors wrapped up in sterilised swaddling in a house full of over sanitised, heavily cleansed surfaces will produce yet another allergy ridden, bed wetting, limp wristed, hipster with dietary issues and no intestinal fortitude.

    Real humans play in the dirt !

  30. Too much freakin control by Anonymous Coward · · Score: 0

    Well, You have to keep a loose control over your child. Let them run, fall down, bump into things.
    They learn. Eating dirt? not so much, but chewing grass tips, straw, and picking vegetables/fruits is pretty good exposure...
    Also: DO NOT freak out when the kids decide to eat a bug, or pick up a froot loop from the floor and gobble it.
    Parents freaking out will give the kids complex complexes about such things. Let the 5-second rule endure,
    and clean your floors!
    How many of you parents who have kids actually dust the house weekly? Vacuum/dust-blast the computer?
    Yes, behind the ginormous tv and in all that wiring!
    So if the house is clean, let the kid be a kid.
    And the pets have to be outdoors some, with the kids, so they all get exposed to low-oncentration allergens and stuff.

  31. huh, by Anonymous Coward · · Score: 0

    I always thought most little girls who thumb sucked were pretty good at sulking dick. They use their tongue good with wierd movements. My niece who always had a pacifier growing up and I could tell on her face when she sucked on my shaft, it was very soothing

    1. Re:huh, by Anonymous Coward · · Score: 0

      I always thought most little girls who thumb sucked were pretty good at sulking dick. They use their tongue good with wierd movements. My niece who always had a pacifier growing up and I could tell on her face when she sucked on my shaft, it was very soothing

      BTW, she says sucking your shaft was soothing because your shaft is the same size as her thumb.

  32. What a surprise by Anonymous Coward · · Score: 0

    Alternate headline: Study Shows Evolved Pervasive Behavior is Adaptive

  33. Re:Republicans raped me in Brazil by Anonymous Coward · · Score: 0

    Protip: Next time, try to not scream, "Yeah, baby!! Harder!! Harder!! Shove it all the way in!!"

  34. Please change the title of this post by u19925 · · Score: 1

    The study only says that kids who such thumb and bit may develop fewer allergies. This does not mean that there are no other side effects and it is overall good for them. The referenced article has a proper title, "Thumb Suckers and Nail Biters May Develop Fewer Allergies".