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I think the increase in the average glycemic value of the American diet is probably one of the bigger culprits. High glycemic food digests much faster than low glycemic food so the caloric absorption is higher.
You'll gain a lot more weight eating 2,000 calories of baked potato and coke than you will eating 2,000 calories of skim milk and wild rice - even if the fat content of both meals is zero.
And the more weight you gain, the slower your metabolism gets which just snowballs.
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