They would do well on more like 25% carbs aka Paleo.
As a distance runner, I don't perform well at 25% carbs. I need more like 40% carbs. So not "high carb", but "higher carb then a sedentary person needs".
Edit: Where "paleo" is defined roughly as "eating only foods that [I think] were available ~10,000 years ago": http://www.abc.net.au/science/articles/2013/09/10/3842158.ht...
They would do well on more like 25% carbs aka Paleo.
As a distance runner, I don't perform well at 25% carbs. I need more like 40% carbs. So not "high carb", but "higher carb then a sedentary person needs".