system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 how the body has developed to not have an upper limit of the fat it can or wants to store

The question came up when thinking about phones stopping to charge when the reaching 100% battery. It appears the body keeps accumulating fat even when it's excessive.
gpt
Because, historically, it hasn't been a problem.  Evolution doesn't have a goal or an end state it is after - it simply 'rewards' traits that grant increased reproductive fitness.

Up until the last ~50 years or so, having _too much_ food has not been a problem, so it was rare for people to get so fat that it caused health issues.  Since it wasn't a common problem, we never evolved to avoid it.