body building... is a different matter altogether.
a good point to note is, during the transition period, it is important to maintain 90% fats intake. however once u are keto adapted, it is generally 60-70% of ur daily calorific intake that comes from fats.
for a newly adapted lchf individual, it is now imperative to balance your daily calories 60-70 fats, 20-30 protein, and abt 10% carbs. carbs come from dark leafy greens, mushrooms, berries, some nuts.
even if u wish to increase ur carbs intake, do so with natural, complex carbs.
for eg. i have had chest pains initially after going on LCHF, and realised that without rice and bananas, it is easy to go low on potassium. fix it with mushrooms.
because a calorie is not simply a calorie. each type of food has its own unique blend of micronutrients, ie ur multivitamins and minerals. im not gonna simply eat bacon for the rest of my life just because it is >70% fats (in calories).
then comes BB. the usual knowledge applies, ie u need to increase ur protein intake so the usual macros may not be optimal for muscular growth. a BB also has to watch his/her nutrients because the lack of it can cause other side effects or muscle atrophy. that is what we want to avoid.
Good thing is on LCHF, a keto-adapted BB will less likely experience muscle atrophy as his ATP(energy) comes from ketones, which is from fats. therefore if one goes low on food consumption, it will be compensated with energy from bodyfats. also, the afterburn from the intense workout, will burn bodyfats as well.
there is no quick answer for LCHF on BB.... because intermittent fasting can also be applied etc etc...