re: Virta - anti-diabetes startup makes huge announcement

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You can maintain peak performance in low carb diets with enough fat adaptation. 

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Not exactly familiar with that study, but that statement does match up with a study I saw while googling the other night. The low carb did maintain performance........the high carb increased performance output for similar VO2 max gains. Im in a training program for triathlon right now and my coach (a former professional duathlete) just did a race nutrition seminar last weekend. I dont believe everything he says exactly as he only pushes a pretty lock step agenda and I do believe there is some variance. So I research a bit on my own. Fat adaptation is real, he even advocates it in training. But total replacement if glycogen use is always going to use more oxygen.

As for your picture, you think hunter/gatherers hunted animals and then gathered animals?

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In the Western 100, 100 mile marathon, the fastest time ever was from a low carb high fat runner.

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Taken from the blog of that guy.

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I still use carbs, but mostly in the form of sweet potatoes and fruits. When I do eat carbs I use them strategically; I’ll eat sweet potatoes with lots of coconut oil the night before a race or long/intense run. I’ll have a green smoothie after a hard run with fruit and whey protein to replenish my glycogen storage and rebuild my muscles

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Training to burn more fat as an energy source is 100% a real thing. It's one of the reasons you should include a lot of very low intensity running/training in your workouts. But even this guy is saying that he's replenishing his glycogen stores. He's selecting he carbs in a much more strict manner, but he's still realizing he needs carbs.