My personal beliefs are that continual carbs are less necessary to someone who has adapted to burning fat. If anyone is used to eating high carbs they will need a continual supply to keep going. A fat adapted person in ketosis won't run out of fuel as fast as a carb burner without refueling. If our ancestors would have had to eat carbs every 2 hours to keep from failing the human race would have starved out long ago. Research how blood sugar levels work and the processes involved and how ketosis works for a better understanding of differences and limitations of each.