why do i need to put a stupid title here every damn time
The only reason that people put some level of importance on physical attractiveness is because we're all stupid, shallow, thoughtless zombies and just follow along with whatever society pushes on us.
Fat women were once considered beautiful and healthy. Skinny women, in those days, were the "unattractive" ones. Fat men were once considered strong and powerful. Skinny men, in those days, were the "unattractive" ones. But, now...it's the complete opposite. Why? Because, we (as human beings) just go along with whatever is popular and base our lives on fitting in with everybody else.
Clothes go in and out of style. Cars go in and out of style. Haircuts go in and out of style. Color schemes go in and out of style. Patterns go in and out of style. Language goes in and out of style.
Body types go in and out of style, just like everything else.
Personally, I don't believe that it has anything to do with true attraction; it has everything to do with getting the boyfriend/girlfriend with the look and body that society makes you believe that you're "supposed" to have.
That's just my two cents...
I agree with some of what you said, but for different reasons, NOT because we are "stupid shallow zombies".
"Back in the day" Fat people were desireable because it was directly correlated with wealth, not with beauty and health. If you had money, you could afford to eat plenty, and fatness showed that. Or if you go back even further it correlated with survival, people with more fat signified they were good at hunting/gathering food.
However if you look at a timeline, really fat people from medieval times would be less fat than really fat people today (there would also be less of them, the only fat people back then were royalty/nobility), even though there are no benefits of being fat today. We just keep getting fatter and fatter when there is no need.
Now that science has improved, and we know that being fat is not enjoyable nor is it healthy (who wants to have trouble bending over and putting their effing shoes on...THEN be out of breath afterward?), our minds have indeed switched to being attracted to healthier-looking people. Its been proven that healthier people have sharper minds, better sex, and an overall happier existence. So why would we NOT want to be healthier and leaner?
However, it IS a little different for women because some cultures really did actually see heavier women as beautiful, and there is actually 1 such culture that I know of that still sees it that way. One way to notice this is to look at the trends in art over hundreds of years (at one time, paintings reflected a plump belly, round bottom, and smaller chest on women was the pinnacle of feminine beauty).
Sooo, it seems that it could be a combination of BOTH society norms AND health benefits.
If we didn't put any importance on physical attractiveness we wouldn't be human beings. All of us want to be physically attractive, if it weren't for physical attractiveness none of us would be here, because no one would want to have sex with anybody. Its something in our brains that is just natural.
TRUE attraction comes AFTER physical attraction, when you start to really know and love your significant other just for being who they are.