Let's compare, shall we..
In this next picture...who looks better?
The skinnier chick, obviously. They are both pretty, but their bodies speak for themselves. Skinny says control, ambition, talent. Fat says "I'd rather eat this double cheeseburger than care about my body" aka lazy/utilitarian/thoughtless. Maybe I'm biased. But damn. This picture is striking and I absolutely think the first girl is way hotter. It is a simple truism that humans are attracted to fit bodies. I want to be on the receiving end!!
I have to say though, after looking again, these girls definitely look digitally altered: