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Older siblings are more potential to suffer from food allergies than their younger brother and sisters , allot to a newfangled survey .
Among the report participants , the preponderance offood allergieswas 4 per centum in firstborn tyke , 3.5 percentage in second - born child , and 2.6 percent in those born later .
Firstborns were also more likely to have allergic rhinitis ( an itchy , run nose ) and conjunctivitis ( inflammation of the eyelids ) than their young siblings . However , nativity rescript did not seem to touch on nestling ’s susceptibility toasthmaor atopic dermatitis ( a eccentric ofeczema ) .
old field have shown a link betweenbirth orderand vulnerability to allergies , but the new work examined how this effect differ depending on the character of allergy . The study is the first to show this " birth order effect " happen specifically in intellectual nourishment allergy , the researcher say .
The finding are based on surveys of more than 13,000 minor age 7 to 15 . The research worker compare the preponderance of each allergy to the small fry ’s birth order .
Researchers are n’t sure why younger sib come out to have some protection againstallergiescompared to older siblings . It may have something to do with changes in the womb or prenatal environment . For instance , multiple pregnancies may induce changes to the female parent ’s immune system , which may affect the fetus , said written report researcher Takashi Kusunoki , of the Shiga Medical Center for Children in Shiga , Japan .
The birth order effect may also be tied to the hygiene hypothesis , the mind that an environment that is too clean may cause the immune system to oppose to harmless substances , and thus extend to allergies . More nipper in the menage mean more bug . Younger sib may be disclose to more pathogens at an earlier historic period than their sr. siblings , Kusunoki recount MyHealthNewsDaily .
The survey also asked parents whether their children have wheezing , eczema or nutrient allergic reaction before age 1 . The research worker saw the same upshot — the relative incidence of food allergies was low-spirited in younger siblings . This paint a picture the force may have its descent in the uterus , the researcher say .
The findings were presented March 20 at the Annual Meeting of the American Academy of Allergy , Asthma and Immunology in San Francisco .
Pass it on : Older sibling may be more probable to suffer from food allergies and conjunctivitis .
