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Your not fat because you eat McDonalds everyday.... your not fat because you scarf down cookie dough like potato chips.... no no no..
Blame it on the Ice Age.
Blame it on the Ice Age.

http://msnbc.msn.com/id/6885161/site/newsweekDarwin's Revenge
Why are we getting fat? Because our genes date from the last Ice Age.
By Fred Guterl
Of nature's many guises, winter at the Arctic Circle would have to be one of the least subtle. It's hard to imagine that humans would have survived generations of frigid climate without some adaptation giving them a way to cope. Scientists have in fact postulated a "thrifty genotype" that some humans acquired 30,000 or so years ago during their migration from Asia, across a land bridge at what's now the Bering Strait, to North America. These genes may have given cold warriors an ability to store fat and metabolize it sparingly, a handy trait for the dark, cold months when food is scarce.