I think Seafire might be getting a little cantankerous in his old age. It must boggle the mind that one of the main ingredients in a bore cleaner is also in his food.
Foods With Sodium Nitrate
Sodium nitrate isn't used in many foods, according to the American Meat Institute, and you're more likely to find sodium nitrite, one of the compounds formed spontaneously from sodium nitrate. However, natural sodium nitrate is still used in dry cured meats and meats made in specialty shops. Examples of these types of meats include prosciutto, capicola, salami, pancetta and lardo. If you're eating these meats, read the ingredients list to see if it contains the food additive. You can also ask the butcher or maker of the meat for information about the preservative content.
