Do you really thing the carbohydrates are which cause your fatigue or lack of energy ??
All I am saying is that perhaps carbohydrates are not so necessary after all. But to each his own, maybe someone needs less or another needs more carbs. I feel that energy wise, I would be quite okay in limiting my carb intake indefinitely.
And I am not on zero carbs either so to say. I get them from vegetables and dried beans, lentils etc.