What is considered fat? Whatever the media says is fat.
Do you have any idea how much money there is in making people feel bad about how they look?
Want proof? Look in any womens or mens magazine. Count the advertisers...now how many of them are for things other than the "How to improves"?
They make their money by making you believe you don't measure up. They make their money by making you feel like you're ugly, or fat, or you don't dress the right way.
They don't have to tell the truth. They don't even have to come close. If there were laws requiring honesty they would all be out of business in short order.
I bet if you lined up the owners of these publications, most would be fat, ugly, poorly dressed, or any combination of the three. Do you think they care? Not with your hard earned money in their pockets.