Fat burning vs carb use
I've been on Paleo for four weeks. In your experience is it true that you become a more efficient fat burner and over time you are less reliant on carbs, or do you always need carbs if you are exercising for any extended period of time? At the moment I can walk for maybe 1.5 hours in a day on a low/no carb diet, but if I go over this, I am totally zonked out by the time I get home.
Also, if you have achieved a fat burning metabolism, what is this like? Does it give you more stamina than you had before?