GMO labeling is an emotionally thorny issue that is argued on the basis of food safety, but it has moved well beyond the science that should be the determining factor.The Oxford Dictionary defines a fad as “an intense and widely shared enthusiasm for something, especially one that is short-lived and without basis in the object’s qualities.” Americans have had plenty of exposure to fads of all kinds, including clothing styles and popular dances, that last until other ones come along. Even politics can involve fads. Some might say that Donald Trump, the leading contender to be the Republican Party’s presidential candidate, is himself a fad.Fads can be found in nearly all facets of our lives and in nearly everything we consume. They can and do...