How Little Vermont Got Big Food Companies To Label GMOsYou'll soon know whether many of the packaged foods you buy contain ingredients derived from genetically modified plants, such as soybeans and corn. Over the past week or so, big companies including General Mills, Mars and Kellogg have announced plans to label such products – even though they still don't think it's a good idea. The reason, in a word, is Vermont. The tiny state has boxed big food companies into a corner. Two years ago, the state passed legislation requiring mandatory labeling. The Grocery Manufacturers Association has fought back against the law, both in court and in Congress, but so far it's been unsuccessful. And since food companies can't create different packaging just for Vermont, it appears that the tiniest of states has created a labeling standard that will go into effect nationwide.