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To keep your kids from developing an allergy to peanuts, should you give them nuts at an early age or withhold them? For years the debate has generated more heat than light, but today a landmark study led by King's College London researchers offers some potent evidence that suggests giving peanuts to infants dramatically decreases the risk of developing an allergy to peanuts.

It may sound radical, but it works: Eating peanuts slashes the chance of a peanut allergy, at least in children at high risk of developing one, a much-anticipated study finds. The results are likely to catapult a long-standing theory-that ingesting potential food allergens is a way to prevent allergies-into mainstream medicine. "This is the study," says Rebecca Gruchalla, a specialist in allergy immunology at the University of Texas Southwestern Medical Center in Dallas, who wasn't involved in it. The data, she says, are "just mind-blowing."

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Why are millions of people allergic to peanuts or pollen, but hardly anyone seems to have a reaction to rice or raisins? Because only some of these things carry molecules similar to those found in parasites that send our immune systems into hyperdrive, according to a new study. The advance could help researchers predict what other foods might cause allergies.