Peanut allergy is proving a tough nut to crack. Many people seem able to overcome the allergy by consuming tiny-but-increasing amounts of the legume daily for months or years. But the protection often evaporates if they fail to keep eating peanuts regularly, a new study shows. Twenty people with the allergy could eat a handful of peanuts after two years of bit-by-bit consumption, but 17 of them relapsed after avoiding peanuts for several months and then trying to eat some.
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