If one child in a family has a peanut allergy, what are the chances that another child will develop the allergy?
And what are the chances that the first child will grow out of the allergy?
Peanut Allergies in Families
I have fraternal twins and one has a life-threatening allergy to peanut protein. The other has no allergies.
My husband and I do not have food allergies. We have a combined total of three siblings and fifteen cousins. Of these 18 individuals, only one cousin had food allergies (milk and wheat) which she outgrew. We have one nephew who recently outgrew his egg allergy and a niece who is allergic to bananas.
While allergies and asthma do occur in both mine and my husband's families, there doesn't seem to be a specific trend toward peanut allergy. Not exactly scientific, but I hope this is helpful.
I have been allergic to peanuts since early childhood. One of my three children is also allergic (he does not have children). I haven't found anyone else in my family with this allergy.
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According to The Anaphylaxis Campaign, a sibling of a child with allergies has a higher chance of developing that same allergy. There is a 7 percent risk that the sibling of a peanut-allergic child will develop the same food allergy. In non-allergic families, there is a 1 to 2 percent risk of developing an allergy.
While there are several factors that play into developing an allergy, a study on twins found that genetics accounts for 81.6 percent of the risk of peanut allergy. You can read more on the study here.
Regarding your question about children outgrowing the allergy, the majority of those with a peanut allergy have it for the rest of their lives. Approximately 20 percent of peanut allergy sufferers outgrow the allergy.
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