Nope. Not simple at all and not even necessarily due to factors under a persons control:
"Some factors are out of your control. People are born with metabolic differences. Some have a higher resting metabolic rate or produce more fat-burning enzymes than others. People with a low percentage of slow-twitch muscle fibers seem less able to burn fat in skeletal muscles and thus may have a harder time losing weight through exercise,"
Taken from (please read this):
Exercise = Weight Loss, Except When It Doesn’t - New York Times
Please understand the reason people eat burgers isn't necessarily because they desire it,
per se. Cultural influences, upbringing, price, and ease of access can heavily influence the varieties of food that you "choose" to eat.
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