http://culinaryarts.about.com/od/seasoningflavoring/a/nitrates.htmhere's one paragraph from that articleSeveral decades ago, some researchers raised the possibility that nitrites could be linked to cancer in laboratory rats. This suggestion received a lot of media attention. What received less media attention, however, was when further research revealed that they were wrong. Indeed, the National Academy of Sciences, the American Cancer Society and the National Research Council all agree that there's no proof of cancer risk from consuming sodium nitrite.also Given that sodium nitrate occurs naturally in foods like spinach, carrots and celery, as well as the fact that nitrite has never been shown to cause cancer, all the fuss about nitrates and nitrites might seem like typical media-driven hysteria. Moreover, the supposedly "natural" or "organic" versions of these products can contain many times more sodium nitrate than their conventional counterparts. But when you consider the increased likelihood of contracting botulism, it's actually the nitrate-free products that present the real health risk.it's generally a good idea to eat as little processed food as possible though imho.. bacon and pepperoni are really the only two i eat on a regular basis.. sometimes jerkyalso herehttp://chriskresser.com/the-nitrate-and-nitrite-myth-another-reason-not-to-fear-bacon