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I look at the picture of Buffy and see a robust, healthy young woman.
Despite the recent redefination of "big-boned" to mean "fat," it is abundantly evident to any observer that some humans have large, robust bones, while others have more fragile skeleton. Medically, the large-boned woman is less prone to the ravages of osteoporosis, so this genetic trait is advantageous in every way except that a large-boned woman will never fit into "size zero."
Working in the medical field, I have seen too many instances of healthy girls who are heavier only because they have a larger frame and greater muscle mass, who lose pride in their appearance because they never see their own body type depicted in a positive way. In some cases this poor self esteem leads to overeating, thereby creating true obesity.