Delaying Food Introduction Won't Prevent Allergies
Tue Mar 22, 3:33 PM ET
By Megan Rauscher
SAN ANTONIO (Reuters Health) - Delaying the introduction of highly allergenic foods -- other than milk -- does not seem to be effective in preventing food allergies, according to research presented here Tuesday during the 61st annual meeting of the American Academy of Allergy Asthma and Immunology.
"It is probably not useful for children in families at high risk for to delay the introduction of these foods." However, additional studies are needed before definite conclusions and recommendations can be made, Dr. Berber J. Vlieg-Boerstra, who presented his team's work, told Reuters Health.
"The delayed introduction of highly allergenic foods is often recommended for the primary prevention of food allergy in high risk infants," the researcher, based at University Hospital Groningen in the Netherlands, pointed out. "For example, the American Academy of Pediatrics recommends postponing the introduction of egg, fish, tree nut and peanuts until after the age of two or three." But the efficacy of this approach is poorly documented.
To investigate, Vlieg-Boerstra and colleagues studied 41 children who were an average of six years old who had egg, soy, peanut and hazelnut eliminated from their diet from birth in an attempt to prevent the development of allergy to these foods.
The investigators used food challenge tests to determine the rate of clinical reactivity to the eliminated foods. The study included a placebo (control) group of 49 age-matched children with suspected food allergy who had not avoided these foods.
"We found no clinical differences in the number of positive or in the threshold dose between cases and controls," Vlieg-Boerstra said. "As many children in the primary prevention group as in the control group showed food allergic reactions to these foods and the amount of allergenic food the children reacted to was similar in both groups."
Further analysis showed that a higher RAST score (specific IgE) or skin prick test increased the relative risk of a positive food challenge test, by 30 percent and six percent, respectively, while gender, family history of allergy or sensitization and dietary avoidance did not.
Vlieg-Boerstra cautioned, however, that a significant number of children -- 39 percent in this study -- may have allergic reactions following their first known exposure to allergenic foods.
"Sensitized children are at greater risk, so we recommend that sensitized children should have their first exposure to these foods under medical supervision," he said.
He added that he was not really surprised by the results, noting that "sensitization to foods can take place prior to birth or during breast feeding -- and another recently completed study from our center shows that complete avoidance does not seem feasible for most patients."
On Mar 24, 2005
I just received this info. in an e-mail from Allergy Health Online. I was curious as to what everyone thinks about it.
I think I'll take this information as I have approached my current pregnancy with my second child. I am avoiding all peanuts, tree nuts, and seafood now and during nursing. If it doesn't help, at least I will feel that I tried.
I don't think I'll be running out and buying my PA daughter (almost three years old) a seafood dinner just because of this article [img]http://uumor.pair.com/nutalle2/peanutallergy/smile.gif[/img]
Again, I'm interested to hear others' opinions.
On Mar 24, 2005
I was just coming over here to post this link from Ivillage.com. It's a question from a reader who wanted to know why her child's pediatrician recommended waiting until a child was 3 to introduce peanut butter. The doctor's answer was that she could find no supporting literature: