Keto diet is the best to burn fat but you lose muscle and size to , so in my opinion is only good option for obese people or people that only want to lose weight not caring about muscle . Keto diet on fitness and bodybuilding dont make any sense since the goal on fitness athletes is always keep or gain muscle mass and lose all body fat .

best diet for bodybuilder on cutting is cycling carbs HIGH / LOW days and on bulking is high protein + high carbs and low fat .

Basic trusted and truth chicken and rice .