Why would you find that a contradiction?
Being overweight does not preclude talent or competence in fields where ability as opposed to one's appearance is important i.e. most of the technical fields in the entertainment industry as well as many, many others. Nobody cares what people who light the sets, schlep the equipment, operate the cameras, check the continuity, write the scripts etc look like. At all. Film directors, major film producers, are often fat too. Peter Jackson who directed the LOTR trilogy was morbidly obese. Luc Besson looks like a beachball on legs and usually has grease stains down his front. George Lucas grew steadily fatter as he grew steadily richer. Harvey Weinstein for all his sins, was an incredible producer at Miramax's peak which is why people put up with his shite as long as they did, because he brought in the cash and the Oscars. He was also a giant fat bastard. Joel Silver was a fat bastard too. The obsession with weight in the industry is generally confined to camera-facing talent and the pink collar shite jobs.
As for fast food, it's immensely popular worldwide and across all classes. it's engineered that way. it appeals to the broadest demographic as it hits the fat/salt/sweetness receptors which all humans share. No learning curve.
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