BrianL
Doom Buggy Driver
- Joined
- Jul 24, 2013
- Messages
- 26,476
Mayo's not a dairy product. Made at home, it's oil, eggs, and flavorings (spices, acids). Commercial mayo has several different preservatives in it, is made with pasteurized egg products, and contains more acid (vinegar) than homemade versions (read the label). Commercially produced mayonnaise is an environment within which very few bacteria can survive because of the high fat content, high acid content, and subsequent lack of air due to the fat and lack of protein, which bacteria need for a food source. If my mayo was out on the counter overnight, I'd put it back in the fridge.
While it is true that processed foods will last a long time without going bad in the sense that they would make you sick, older mayonaise can tend to taste a little off. I usually chuck it when it gets that yellow stuff around the top. Generally though, if I left something out, the smell test would be my guide really. I don't tend to be too uptight about such things.