Anonymous wrote:

Anonymous wrote:

Anonymous wrote:Isn’t food safer in a Thermos compared to cold cut meat on a sandwich sitting in room temperature?

It really has to be. I survived years of warm mayo sandwiches. Luke warm mac n cheese is fine. Plus the new thermos containers really trap in heat.

Mayo is slightly acidic. It's less dangerous than you think. Same goes for any tomato-based sauces.

True. Commercially produced mayonnaise is actually safe at room temperature, even after being opened. It has enough acidity (lemon juice or vinegar) to keep it safe. However, after it has been opened, it may separate and have a different flavor if it is not refrigerated.