It's all to do with gravitational time dilation.
Because the Americans are so much fatter time appears to pass at a marginally slower rate.
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Sun 29 Mar 2009, 2:11,
archived)
Does this mean
If you leave a fat personMerkin and go for a run, when you get back they will seem older and fatter but you won't have aged?
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Sun 29 Mar 2009, 2:14,
archived)