Whole Foods Fools: Walter Robb, co-CEO of the foodie marketing chain Whole Foods, last week announced that his grocery chain would require the labeling of foods with any biotech beginning in 2018. In doing so, he presented many fallacies, such as asserting that "the science is very mixed" on the harmfulness of biotech foods. It is pretty straightforward when using peer reviewed studies. But the move could actually harm investors in the company. Most shoppers at the chain likely already believe they are buying non-biotech food, and many of the product suppliers try to avoid their use.Whole Foods has just 2.7 percent of U.S. grocery sales. Foods labeled as containing biotech are not only unlikely to be purchased by Whole Foods' customer bas...