system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: When and why did the image of what is attractive move from a little bit of fat to very low body fat percentage?

It seems like painting from a few hundred years ago always show slightly chubby women and men, whereas current art and images are always of ripped and skinny people? I get that chubbiness was considered attractive as an outward indicator that a person was wealthy/able to feed a family, but why did this change? Why is is considered attractive? Is it a new sign of wealth that you can have a low body fat and therefore be indicating that you can afford to *not* stockpile fat for survival - that you can always just buy more food? Or that you have the free time to exercise? Was that image of beauty simply imposed by society/the media? Is something else at play where physically seeing muscles simply conveys an image of strength?
gpt
I think you have most of it buried in there. At that time, wealth meant being able to eat regularly (and with fatty enough stuff) that you could get plump. Nowadays, anyone can get that amount of caloric load, so it's no longer special. Now, special is having the time and money to not only exercise for health, but do it in such a way as to sculpt your body into the popular shape. And yeah, as we move away from raw physical strength being an automatic indication of lower class (nerd rule ftw!), the upper class has taken it up in some show of old-school power.