Food Allergies Less Common Than Believed, says a study. How they did it: Disguised food and placebos (e.g., peanut butter hiding in something else or something else dressed up as peanut butter).
[T]he true incidence of food allergies is only about 8 percent for children and less than 5 percent for adults…[y]et about 30 percent of the population believe they have food allergies.
Not addressed: How many of those non-allergy allergies are due to stress?