"Fasted Training Boosts Endurance and Muscle Glycogen"

From Lean Gains. 

"Summary


"Quoting straight from the discussion in the full text paper:

"'The main findings of the present study were that: training in an overnight-fasted state enhances storage of muscle glycogen compared to training in the fed state; skeletal muscle of men and women respond differently in terms of oxidative activity to training in the fed and overnight-fasted state; and peak VO2 and peak power improved more when training in the fasted state compared to the fed state.'"

It seems that often for "fasted" you can read "low-carbohydrate".  The advantages to longevity of calorie-restriction, for instance, comes from restricting carbs, as discussed here:

"Low-Carb and Longevity"