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Dom Layman is a friend of mine, and we've had a number of discussions about all this. He's more low-carb than you might think. I'm not sure about the 65% maximal exertion figure. I've got some US military unpublished studies showing there is a point of exertion at which carbs are required for optimal output. But these studies weren't done on carb-adapted subjects. That makes a big difference, and I don't know that there are any studies on maximal output vs carbs on truly carb adapted subjects. I'm also not sure I agree with the 1,400 kcal/day for aging people. Depends upon a lot of variables, so can't really be a one-size-fits-all recommendation.

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He had a gleam in his eyes and excitement in his voice when he mentioned green beans for dinner, so I suspect he is a minimalist when it comes to carbs.

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