What P2ZR said:
Carbs make you sluggish? Reduce them. LOW carbs make you a miserable nonfunctional wreck? Eat more of them. Acellular/fibrous/FODMAPpy carbs do X/Y/Z to you? Tailor accordingly! And goodness gracious, if LC (or whatever else) prevents you from getting a good night’s sleep–how do you expect your body to move well the next day?!