Well, people called Christina Aguilera fat recently. And I saw her and thought "You have to be kidding me."
I was once 172 lbs, about average, but I freaked out and lost heaps of weight and got down to about 140 in a month. It was because people commented and I felt that weight was large. Also I'd always been fairly thin so some clothes were just becoming too small. So I don't think you should blame the media.