Heh - stupidity at Whole Foods

From the American Council on Science and Health:

Whole Foods Sells Both 'Nitrate-Free Meat' And Nitrate Supplements. Yup.
Whole Foods chemists, an incongruity if ever there were one, must have a helluva job. They somehow must explain to suckers customers how the same chemical can be both good and bad for you. And also how an inorganic salt can be "organic" depending on its source. This takes a degree of creativity, and Whole Foods is nothing if not creative, especially when it comes to science. 

More at the site - they go into quite a bit of detail. Vegetables are a very good (ie: high) source of nitrates.