system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: why does frozen food which is already cooked need to be heated to a certain temperature before eating?
gpt
If  properly frozen, rapidly after safe cooking, it does not. There is nothing unhealthy in this case in eating a completely frozen meal. 
Improper freezing can mean you need to get it to 'piping hot' throughout to kill any residual bacteria.