Newhouse News Service Multiple-choice question: Why are more American kids allergic to foods, particularly peanuts? A) Their immune systems are confused by increasingly clean homes. B) Nervous parents wait too long to feed their children peanuts. C) We roast peanuts rather than boil them. D) Maybe one of the above, and/or something else. Unfortunately, the answer is "D." One study estimates American children's rate of allergy to peanuts and tree nuts (like walnuts and pecans) — about 1 percent of those under age 18 — has doubled in recent years. No one can say why. But whatever biological mysteries are...
