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The consumption of carbohydrate is thought to slow down the metabolism because of the thrifty gene effect. A slower metabolism burns up less energy, which could help explain why people on a high-carb diet have more difficulty losing weight.
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Not forgetting that a high-carb diet tends to be high in calories too.
Incidentally, I'm not buying your evolution argument. It's already been demonstrated that in just a few thousand years, human beings evolved from being lactose intolerant to generally able to drink cows' milk. Therefore just because something may have genetically been the case 10,000 years ago doesn't mean it is now.
