A federal judge has dismissed a lawsuit in which a Maryland doctor, Arthur Hoyte, complained that KFC did not warn its customers conspicuously enough about the trans fat in its food. Here is my take on the suit, which was filed last year. KFC has since switched to a specially engineered soybean oil. Since the switch was in the works long before the lawsuit was filed, fans of litigating in the name of "public health" cannot reasonably take credit. But that won't stop them.