WIKIMEDIA, FREESTOCK.CAInfants at high risk of peanut allergies who were exposed to the food ended up less likely to develop the allergy later in life, according to a study published in the New England Journal of Medicine yesterday (February 23). Although the general practice for more than decade has been for babies to steer clear of peanuts, the results give a swift kick to advice that was falling out of favor.

“This study really proves cause and effect,” Hugh Sampson, a pediatric allergist at the Icahn School of Medicine at Mount Sinai in New York City, told Science. “When someone asks me in my practice, I will encourage them to get peanuts in the diet in the first year of life.”

The study randomly assigned more than 500 babies to either eat at least six grams of peanut protein a week or to abstain from peanuts. All of...

“This is a major study—really what we would call a landmark study,” Scott Sicherer, an allergist at Mount Sinai Hospital, told NPR’s The Salt. “There’s been a huge question about why there’s an increase in peanut allergy and what we can do to try to stem that increase. And this is a study that directly addresses that issue.”

The authors were careful to note that children at risk of a peanut allergy should get an exposure test before parents start spooning them peanut butter. Senior author Gideon Lack of Guy’s and St. Thomas’s National Health Service Foundation Trust told The Washington Post: “I believe that the findings are robust enough to tell us that if a child is at risk for peanut allergy . . . that child should immediately, as soon as they develop the first signs, have a skin prick test,” and if it’s negative, to go ahead and eat peanuts regularly.

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