Recently, I read this fascinating piece about global weight gain and it's possible causes. Turns out, it may not be as simple as "eat less and exercise more" to lose weight. There are many, many factors involved from chemicals in the water, genetics, environmental causes, even air conditioning.
Author David Berreby starts with the idea that, if poor diet and lack of exercise are the whole stroy, why then are lab animals, who have essentially been fed the same diet and kept in the same general conditions for decades, also gaining weight? It seems there has to be more to the story.
Though long, I would definitely recommend giving his piece a read. Lots of interesting research and theory to be consumed.
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