THE PEANUT BUTTER SANDWICH THAT most American adults view nostalgically as a mainstay of their childhood has become a food to be feared by an increasing number of parents today. Although data on the epidemiology of food allergies are scant, studies suggest that peanut allergies have tripled in the last 15 years, with 3 million Americans now claiming to be allergic to peanuts or tree nuts. Allergies to cow's milk, egg, wheat, and soy have also spiked.
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