You're probably not allergic to gluten

After millennia of not knowing what gluten was (it’s a protein found in grains), suddenly gluten-free products are everywhere. Gluten-free foods may pull in $7 billion this year alone. Is it an epidemic?  No, say medical writers, it’s more like a fad: probably more than half the people buying gluten-free foods don’t have an adverse reaction to gluten. In the last 50 years the number of people allergic to gluten has risen, but their estimated number doesn’t match the huge gluten-free market. Of course, stick any word and “free” on a box and it sounds better: Shmooten-free. Booten-free. Rooten-free. Who needs all that shmooten, right?  [Source]