If I've make a sandwich or salad for lunch I usually make it the night before and put in in the fridge overnight.
When I get to work, I usually leave in my bag, for several reasons. - The work fridge isn't terribly pleasant, I forget to take it out of my bag, but mostly because the lunch is nicer to eat if it's not fridge cold.
I was told yesterday, that I was risking my health eating prawns that have been out of the fridge for 4 hours.
Surely not? The food is cold when I put it in my bag, the office is heated but not overly warm. The food still feels colder than room temperature by the time I eat it.