I have several long term subs that went on the keto diet and maintained the same level of play (if not improved stamina due to weight loss) throughout. I've toyed around with it, and after I got over the first couple of days of sugar detox, my energy level went through the roof. No carb comas or sugar highs and lows to deal with, just sustained energy and mental clarity throughout the day. I am a life long vegetarian, and I find it easy to do the diet when I want to due to all the meat substitutes available. If I didn't love pasta, bread, and sweet wines so much, I would probably adopt the low carb lifestyle full time.