As a female... my only concern "IS" when i'll have my protein shake! :P
ok ok. kidding aside. I agree with both answers, from John as well as from Kostas.
John had put it nicely, some things simply are primal and wired deep. And the younger people are the more they still are wired to this. Young gurls, young guys often really look for potential mating partners, and here by genes the 'survival of the fittest' counts and everything that appears to be a good match and give a fresh strong mixture in genes when reproducing.
On the other hand young people (and unfortunately also many old ones) are heavily brainwashed and conditioned by media, advertisement, and trends that are being dictated to them.
But also as Kostas said, most females rather look for an athletic type, just as men mostly look for a not too 'big' woman but with yet still females shapes, for primal as well as conditional reasons here too. And just like many females don't like bulky or buff guys, many men do not really feel attracted to strong toned / lean women.
But on the other hand, we are humans and we have this awesome skill to adapt things to our will, and once we learned that outside (being: looks) is not equals inside (being: character etc), we don't really care much about looks anymore at all, and just go by what seems to be a good person and a partner we can share our time with, and who makes us happy,
But it is very true that respect comes and is only earned from yourself. If you feel confident then this is a) how others percieve you.. and b) also how you percieve others. You might even see the same situation just with different eyes now because you are way more confident and relaxed and do not feel taxed by every look you get with the thought they might think bad or minder of you. And also others will react different to you when you are not looking insecure, and like an easy target to make fun of.
Makes sense?
=)