Food allergies in children have risen by nearly 20 percent over the past decade and now affect about 5 percent of all kids, according to federal statistics. While overtesting and overdiagnosis of food allergies may be contributing to the rise, researchers agree that environmental factors — such as certain pollutants or exposure to fewer germs than in the past — are probably also to blame. They’re testing new treatments in an attempt to cure allergies, with limited success.
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