re: Have you ever snuck in an ingredient that someone "didn't eat"?

quote:

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this is because we started introducing peanuts later and later to our kids in fear of the allergy

recent studies have shown that the later you introduce something to a kid, the more likely they are to form an allergy to it

so, in short, give your kid peanut butter early and he/she is less likely to have an allergy to it

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Yes...the immune system sees the protein as a invader and elicits a defense to destroy it (which may be localized or systemic). With that being said, it may result from late introduction or by a change in the immunoresponse to the protein. There are people who will eat a food for years with no symptoms, then will eat it one time and will experience a hypersensitive response.