Yes, I am zero carb as well, sometimes maybe eating fruit a few times per week at most, many weeks I dont consume any carbs. I have found that as long as I eat enough, I will not have diminished energy, and even if I dont eat enough, as long as I sleep enough I will be fine. Sprints are faster than ever with me. Glycogen can be stored via gluconeogenesis, why doesnt anybody know this. 57% of the amino acids you eat have the ability to convert to glucose and be stored as glycogen. The body doesnt let you control it. The body does not play games. If you are ketogenic (zero or low carb) and if your workout regimen requires your body to have more glycogen, your body will either make it from the protein you supply it with through eating, or the protein from your own muscles by breaking your muscles down and converting it to glucose. It is imperative that enough protein is eaten if you are zero carb as the amount of protein you may think you are getting, you really are not.