` There 's no one gene for allergies or asthma . Up to 50 million Americans have some kind of allergy . Scientists do n't know yet what causes a sensitivity . Comment: I'm allergic to peanuts, but not sure if it's because they are in the food or just my body reacting to them.
Up to 50 million Americans have some kind of allergy . Scientists do n't know yet what causes a sensitivity . Comment: I'm allergic to peanuts, but not sure if it's because they are in the food or just my body reacting to them.