I have this theory why "Thin is in."
Ever wonder why glossies feature skinny models and celebrities? Why the person next to you would want to be the next Kate Moss (minus the junkie character)? Why Kankunis and Chinese herbal slimming capsules are selling fast?

Think, if Big is the ideal figure, then people would eat more and more just to achieve greatness, literally, then food supply around the world would be a such major problem, not that it isn't a problem now..and there will be millions more who would starve to death just because everyone is trying to bulk up.

Well, that and people would die quicker with complications relating to obesity and heart diseases.