system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is it not necessary to refrigerate peanut butter? It seems like such an ideal environment for bacteria/mold to grow.
gpt
It might seem so, but it's not.  While peanut butter seems liquidy, it is that way due to peanut oil.  There is virtually no moisture within peanut butter and a high salt content.  This makes it a difficult environment for bacteria.  It's also so dense that bacteria can't move around in it.