Why is the peanut allergy an epidemic that only seems to be found in Western cultures? Over four million people in the United States alone are affected by peanut allergies, while there are no reported cases in India, a country where peanuts are the primary ingredient in many baby food products. Where did this allergy come from? And does medicine play any kind of role in the phenomenon? After her own child had an anaphylactic reaction to peanut butter, historian Heather Fraser decided to discover the answers to these questions.