Don't tread on my food!

Americans love their civil liberties. They love the sentiment of the so-called Gadsden flag, with its coiled rattlesnake and its "Don't tread on me!" warning, originally meant as a message to the British to leave the Colonies alone. And in a survey of more than 1,000 U.S. consumers, the Sentience Institute found overwhelming support for the idea that consumers's choice of diet is a personal one.

Well, up to a point, apparently. Asked…