system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why isn't fish considered "meat"?
gpt
Real answer:

During lent you were supposed to give up a luxury- meat at the time period was considered a luxury while fish was a staple which people needed to survive. 

So fish is considered a meat, it's just exempt from the "no meat on Friday" rule because tradition. 

Overtime this has just evolved to people saying that fish in general isn't meat which isn't true.