Among family, I have found radically different approaches to reheating food that has already been fully cooked. Some will not eat last night's leftovers unless they have been microwaved to the point where every single part of the food is piping hot. Said people consider food that is "cold in the middle" dangerous. Others are happy as long the the meal is sufficiently warmed for it to be safe to eat.
This gives me my question. Why do leftovers need to be reheated before they can be eaten? Is it just for pleasure or is there an actual safety benefit?