system
Given the following post, respond as if you're commenting on Reddit:
human
[ELI5] What happens to food that makes freezing twice a no-no ? I at least have always been told it is a very bad things to do, with no further explaination. How bad is it?
gpt
Freezing, it, reheating it, and then freezing it again exposes the food to the perfect conditions for bacterial growth repeatedly in short period of time.  This vastly increases the chances of food poisoning.